{"id":1210,"date":"2025-03-24T08:52:35","date_gmt":"2025-03-23T23:52:35","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1210"},"modified":"2025-03-24T08:52:35","modified_gmt":"2025-03-23T23:52:35","slug":"%e3%80%90java-random%e5%ae%8c%e5%85%a8%e8%a7%a3%e8%aa%ac%e3%80%91%e5%88%9d%e5%bf%83%e8%80%85%e3%81%a7%e3%82%82%e3%82%8f%e3%81%8b%e3%82%8b%ef%bc%817%e3%81%a4%e3%81%ae%e4%b9%b1%e6%95%b0%e7%94%9f","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1210","title":{"rendered":"\u3010Java Random\u5b8c\u5168\u89e3\u8aac\u3011\u521d\u5fc3\u8005\u3067\u3082\u308f\u304b\u308b\uff017\u3064\u306e\u4e71\u6570\u751f\u6210\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">1. Java\u3067\u306e\u4e71\u6570\u751f\u6210\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u30e9\u30f3\u30c0\u30e0\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\uff1f\u305d\u306e\u7279\u5fb4\u3068\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">\u4e71\u6570\u751f\u6210\u306b\u304a\u3051\u308b\u7528\u8a9e\u306e\u6574\u7406\u3068\u91cd\u8981\u6027<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">2. 7\u3064\u306e\u4e71\u6570\u751f\u6210\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">java.util.Random\u3092\u4f7f\u3063\u305f\u6a19\u6e96\u7684\u306a\u4e71\u6570\u751f\u6210<\/a>      <\/li>      <li>        <a href=\"#i-10\">Math.random\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u30b7\u30f3\u30d7\u30eb\u306a\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-11\">ThreadLocalRandom\u3092\u6d3b\u7528\u3057\u305f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-12\">SecureRandom\u306b\u3088\u308b\u6697\u53f7\u5b66\u7684\u306b\u5b89\u5168\u306a\u4e71\u6570\u751f\u6210<\/a>      <\/li>      <li>        <a href=\"#i-13\">\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u305f\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u751f\u6210<\/a>      <\/li>      <li>        <a href=\"#i-14\">\u30ab\u30b9\u30bf\u30e0\u7bc4\u56f2\u3067\u306e\u4e71\u6570\u751f\u6210\u624b\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">\u30b7\u30fc\u30c9\u5024\u3092\u6d3b\u7528\u3057\u305f\u518d\u73fe\u53ef\u80fd\u306a\u4e71\u6570\u751f\u6210<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">3. \u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5225\u306e\u6700\u9069\u306a\u4e71\u6570\u751f\u6210\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u30b2\u30fc\u30e0\u958b\u767a\u3067\u306e\u4e71\u6570\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-18\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u91cd\u8981\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u6027\u80fd\u304c\u8981\u6c42\u3055\u308c\u308b\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-20\">4. \u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-21\">\u7bc4\u56f2\u6307\u5b9a\u6642\u306e\u5178\u578b\u7684\u306a\u30df\u30b9\u3068\u5bfe\u7b56<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-24\">\u4e71\u6570\u306e\u504f\u308a\u304c\u767a\u751f\u3059\u308b\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-27\">5. \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-28\">\u5404\u5b9f\u88c5\u65b9\u6cd5\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-29\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3068\u5bfe\u7b56\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-30\">6. \u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u5fdc\u7528<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-31\">\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-33\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u306e\u4e71\u6570\u306e\u6271\u3044\u65b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-34\">7. \u307e\u3068\u3081\u3068\u6b21\u306e\u30b9\u30c6\u30c3\u30d7<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-35\">\u7528\u9014\u5225\u304a\u3059\u3059\u3081\u306e\u5b9f\u88c5\u65b9\u6cd5\u307e\u3068\u3081<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-38\">\u4eca\u5f8c\u306e\u5b66\u7fd2\u306e\u305f\u3081\u306e\u30ea\u30bd\u30fc\u30b9\u7d39\u4ecb<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">1. Java\u3067\u306e\u4e71\u6570\u751f\u6210\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u30e9\u30f3\u30c0\u30e0\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\uff1f\u305d\u306e\u7279\u5fb4\u3068\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>Java\u3067\u4e71\u6570\u3092\u751f\u6210\u3059\u308b\u969b\u306b\u4e2d\u5fc3\u7684\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u306e\u304c<code>java.util.Random<\/code>\u30af\u30e9\u30b9\u3067\u3059\u3002\u3053\u306e\u30af\u30e9\u30b9\u306f\u3001\u64ec\u4f3c\u4e71\u6570\uff08pseudo-random numbers\uff09\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u69d8\u3005\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-2\">Random \u30af\u30e9\u30b9\u306e\u4e3b\u306a\u7279\u5fb4<\/h4>\n\n\n<div id=\"id-901f7e38-be40-4e3b-a012-6b127ab250f8\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u521d\u671f\u5316\u306e\u5bb9\u6613\u3055<\/td><td>\u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u307e\u305f\u306f\u30b7\u30fc\u30c9\u5024\u3092\u6307\u5b9a\u3057\u3066\u521d\u671f\u5316\u53ef\u80fd<\/td><\/tr><tr><td>\u578b\u5225\u30e1\u30bd\u30c3\u30c9\u63d0\u4f9b<\/td><td>int, long, float, double \u306a\u3069\u306e\u5404\u7a2e\u30c7\u30fc\u30bf\u578b\u306b\u5bfe\u5fdc<\/td><\/tr><tr><td>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u6027<\/td><td>\u5185\u90e8\u72b6\u614b\u3092\u540c\u671f\u7684\u306b\u7ba1\u7406\u3057\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u3082\u5b89\u5168<\/td><\/tr><tr><td>\u4e88\u6e2c\u53ef\u80fd\u6027<\/td><td>\u540c\u3058\u30b7\u30fc\u30c9\u5024\u3092\u4f7f\u7528\u3059\u308b\u3068\u540c\u3058\u4e71\u6570\u5217\u3092\u751f\u6210<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u4ee5\u4e0b\u304c\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ Random\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\nRandom random = new Random();\n\n\/\/ \u5404\u7a2e\u30c7\u30fc\u30bf\u578b\u306e\u4e71\u6570\u751f\u6210\nint randomInt = random.nextInt();        \/\/ \u4efb\u610f\u306e\u6574\u6570\nint boundedInt = random.nextInt(100);    \/\/ 0\u4ee5\u4e0a100\u672a\u6e80\u306e\u6574\u6570\ndouble randomDouble = random.nextDouble(); \/\/ 0.0\u4ee5\u4e0a1.0\u672a\u6e80\u306e\u5c0f\u6570\nboolean randomBoolean = random.nextBoolean(); \/\/ true \u307e\u305f\u306f false<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u4e71\u6570\u751f\u6210\u306b\u304a\u3051\u308b\u7528\u8a9e\u306e\u6574\u7406\u3068\u91cd\u8981\u6027<\/h3>\n\n\n\n<p>\u4e71\u6570\u751f\u6210\u3092\u7406\u89e3\u3059\u308b\u4e0a\u3067\u3001\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u7528\u8a9e\u3068\u6982\u5ff5\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-4\">1. \u30b7\u30fc\u30c9\u5024\uff08Seed\uff09<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e71\u6570\u751f\u6210\u306e\u958b\u59cb\u70b9\u3068\u306a\u308b\u5024<\/li>\n\n\n\n<li>\u540c\u3058\u30b7\u30fc\u30c9\u5024\u3092\u4f7f\u7528\u3059\u308b\u3068\u540c\u3058\u4e71\u6570\u5217\u304c\u751f\u6210\u3055\u308c\u308b<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u3084\u518d\u73fe\u6027\u304c\u5fc5\u8981\u306a\u5834\u9762\u3067\u91cd\u8981<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30b7\u30fc\u30c9\u5024\u3092\u6307\u5b9a\u3057\u3066Random\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\nRandom seededRandom = new Random(42L);<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">2. \u64ec\u4f3c\u4e71\u6570\u751f\u6210\u5668\uff08PRNG: Pseudo-Random Number Generator\uff09<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306b\u3088\u3063\u3066\u751f\u6210\u3055\u308c\u308b\u6c7a\u5b9a\u8ad6\u7684\u306a\u4e71\u6570\u5217<\/li>\n\n\n\n<li>\u5b8c\u5168\u306a\u30e9\u30f3\u30c0\u30e0\u6027\u3067\u306f\u306a\u304f\u3001\u6570\u5b66\u7684\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u57fa\u3065\u304f<\/li>\n\n\n\n<li>\u4e00\u822c\u7684\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u5341\u5206\u306a\u300c\u30e9\u30f3\u30c0\u30e0\u6027\u300d\u3092\u63d0\u4f9b<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-6\">3. \u4e71\u6570\u306e\u7bc4\u56f2\uff08Bounds\uff09<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u751f\u6210\u3055\u308c\u308b\u4e71\u6570\u306e\u4e0a\u9650\u3068\u4e0b\u9650<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u7bc4\u56f2\u6307\u5b9a\u304c\u91cd\u8981\u306a\u7406\u7531\uff1a<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u305f\u5236\u5fa1<\/li>\n\n\n\n<li>\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u9632\u6b62<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u7bc4\u56f2\u3092\u6307\u5b9a\u3057\u305f\u4e71\u6570\u751f\u6210\u306e\u4f8b\nRandom random = new Random();\n\n\/\/ \u7279\u5b9a\u306e\u7bc4\u56f2\u306e\u4e71\u6570\u3092\u751f\u6210\uff08\u4f8b\uff1a1\u304b\u30896\u307e\u3067\u306e\u30b5\u30a4\u30b3\u30ed\uff09\nint dice = random.nextInt(6) + 1;  \/\/ 1\u304b\u30896\u307e\u3067\u306e\u6574\u6570\n\n\/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7bc4\u56f2\u6307\u5b9a\uff08\u4f8b\uff1a-5.0\u304b\u30895.0\u307e\u3067\uff09\ndouble rangeDouble = -5.0 + (random.nextDouble() * 10.0);<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-7\">4. \u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\uff08Entropy\uff09<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e71\u6570\u306e\u4e88\u6e2c\u4e0d\u53ef\u80fd\u6027\u3084\u300c\u30e9\u30f3\u30c0\u30e0\u6027\u300d\u306e\u5ea6\u5408\u3044<\/li>\n\n\n\n<li>\u9ad8\u3044\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u304c\u5fc5\u8981\u306a\u5834\u9762\uff1a<\/li>\n\n\n\n<li>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u95a2\u9023\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u6697\u53f7\u5316\u30ad\u30fc\u306e\u751f\u6210<\/li>\n\n\n\n<li>\u8a8d\u8a3c\u30c8\u30fc\u30af\u30f3\u306e\u751f\u6210<\/li>\n<\/ul>\n\n\n\n<p>\u4e71\u6570\u751f\u6210\u306e\u57fa\u790e\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u4ee5\u4e0b\u306e\u7406\u7531\u3067\u91cd\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u54c1\u8cea\u4fdd\u8a3c<\/strong>\uff1a\u751f\u6210\u3055\u308c\u308b\u4e71\u6570\u306e\u54c1\u8cea\u3084\u7279\u6027\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u9078\u629e\u3067\u304d\u308b<\/li>\n\n\n\n<li><strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/strong>\uff1a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u91cd\u8981\u306a\u5834\u9762\u3067\u9069\u5207\u306a\u4e71\u6570\u751f\u6210\u65b9\u6cd5\u3092\u9078\u629e\u3067\u304d\u308b<\/li>\n\n\n\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/strong>\uff1a\u7528\u9014\u306b\u5fdc\u3058\u305f\u6700\u9069\u306a\u5b9f\u88c5\u65b9\u6cd5\u3092\u9078\u629e\u3067\u304d\u308b<\/li>\n\n\n\n<li><strong>\u30c7\u30d0\u30c3\u30b0\u5bb9\u6613\u6027<\/strong>\uff1a\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u969b\u306e\u539f\u56e0\u7279\u5b9a\u3068\u89e3\u6c7a\u304c\u5bb9\u6613\u306b\u306a\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u57fa\u790e\u77e5\u8b58\u3092\u8e0f\u307e\u3048\u305f\u4e0a\u3067\u3001\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">2. 7\u3064\u306e\u4e71\u6570\u751f\u6210\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">java.util.Random\u3092\u4f7f\u3063\u305f\u6a19\u6e96\u7684\u306a\u4e71\u6570\u751f\u6210<\/h3>\n\n\n\n<p><code>java.util.Random<\/code>\u30af\u30e9\u30b9\u306f\u3001\u6700\u3082\u4e00\u822c\u7684\u306a\u4e71\u6570\u751f\u6210\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u69d8\u3005\u306a\u30c7\u30fc\u30bf\u578b\u306b\u5bfe\u5fdc\u3057\u3001\u4f7f\u3044\u3084\u3059\u3044 API \u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class StandardRandomExample {\n    public static void main(String[] args) {\n        Random random = new Random();\n\n        \/\/ \u6574\u6570\u306e\u4e71\u6570\u751f\u6210\n        int randomInt = random.nextInt();        \/\/ \u4efb\u610f\u306e\u6574\u6570\n        int boundedInt = random.nextInt(100);    \/\/ 0-99\u306e\u6574\u6570\n\n        \/\/ \u5c0f\u6570\u306e\u4e71\u6570\u751f\u6210\n        double randomDouble = random.nextDouble(); \/\/ 0.0-1.0\u672a\u6e80\n        float randomFloat = random.nextFloat();    \/\/ 0.0f-1.0f\u672a\u6e80\n\n        \/\/ \u914d\u5217\u306e\u751f\u6210\n        byte[] bytes = new byte[10];\n        random.nextBytes(bytes);                  \/\/ \u30d0\u30a4\u30c8\u914d\u5217\u3092\u30e9\u30f3\u30c0\u30e0\u306b\u586b\u3081\u308b\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">Math.random\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u30b7\u30f3\u30d7\u30eb\u306a\u5b9f\u88c5<\/h3>\n\n\n\n<p><code>Math.random()<\/code>\u306f\u3001\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u4e71\u6570\u751f\u6210\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u5185\u90e8\u7684\u306b\u306f<code>Random<\/code>\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3088\u308a\u7c21\u6f54\u306a\u8a18\u8ff0\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MathRandomExample {\n    public static void main(String[] args) {\n        \/\/ 0.0\u4ee5\u4e0a1.0\u672a\u6e80\u306e\u4e71\u6570\u751f\u6210\n        double random = Math.random();\n\n        \/\/ \u7279\u5b9a\u7bc4\u56f2\u306e\u6574\u6570\u3092\u751f\u6210\uff08\u4f8b\uff1a1-6\u306e\u30b5\u30a4\u30b3\u30ed\uff09\n        int dice = (int)(Math.random() * 6) + 1;\n\n        \/\/ \u7279\u5b9a\u7bc4\u56f2\u306e\u5c0f\u6570\u3092\u751f\u6210\uff08\u4f8b\uff1a-5.0\u304b\u30895.0\u307e\u3067\uff09\n        double rangeDouble = -5.0 + (Math.random() * 10.0);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">ThreadLocalRandom\u3092\u6d3b\u7528\u3057\u305f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u5b9f\u88c5<\/h3>\n\n\n\n<p><code>ThreadLocalRandom<\/code>\u306f\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u512a\u308c\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u767a\u63ee\u3057\u307e\u3059\u3002\u5404\u30b9\u30ec\u30c3\u30c9\u304c\u72ec\u81ea\u306e\u4e71\u6570\u751f\u6210\u5668\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6301\u3064\u305f\u3081\u3001\u540c\u671f\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u767a\u751f\u3057\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ThreadLocalRandomExample {\n    public static void main(String[] args) {\n        \/\/ \u73fe\u5728\u306e\u30b9\u30ec\u30c3\u30c9\u7528\u306e\u4e71\u6570\u751f\u6210\u5668\u3092\u53d6\u5f97\n        ThreadLocalRandom current = ThreadLocalRandom.current();\n\n        \/\/ \u7bc4\u56f2\u3092\u6307\u5b9a\u3057\u305f\u4e71\u6570\u751f\u6210\n        int randomInt = current.nextInt(1, 101);     \/\/ 1-100\u306e\u6574\u6570\n        double randomDouble = current.nextDouble(0, 1); \/\/ 0.0-1.0\u672a\u6e80\n\n        \/\/ \u30b9\u30c8\u30ea\u30fc\u30e0API\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\n        IntStream randomStream = current.ints(10, 1, 7); \/\/ 1-6\u306e\u30b5\u30a4\u30b3\u30ed\u309210\u56de\u632f\u308b\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">SecureRandom\u306b\u3088\u308b\u6697\u53f7\u5b66\u7684\u306b\u5b89\u5168\u306a\u4e71\u6570\u751f\u6210<\/h3>\n\n\n\n<p><code>SecureRandom<\/code>\u306f\u3001\u6697\u53f7\u5316\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u91cd\u8981\u306a\u5834\u9762\u3067\u4f7f\u7528\u3059\u308b\u9ad8\u54c1\u8cea\u306a\u4e71\u6570\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SecureRandomExample {\n    public static void main(String[] args) {\n        try {\n            \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u521d\u671f\u5316\n            SecureRandom secureRandom = new SecureRandom();\n\n            \/\/ \u7279\u5b9a\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u6307\u5b9a\u3057\u3066\u521d\u671f\u5316\n            SecureRandom sha1Random = SecureRandom.getInstance(\"SHA1PRNG\");\n\n            \/\/ \u30c8\u30fc\u30af\u30f3\u751f\u6210\u306e\u4f8b\n            byte[] token = new byte[16];\n            secureRandom.nextBytes(token);\n\n            \/\/ \u30d1\u30b9\u30ef\u30fc\u30c9\u30bd\u30eb\u30c8\u306e\u751f\u6210\u4f8b\n            byte[] salt = new byte[16];\n            secureRandom.nextBytes(salt);\n\n            \/\/ \u7bc4\u56f2\u3092\u6307\u5b9a\u3057\u305f\u5b89\u5168\u306a\u4e71\u6570\u751f\u6210\n            int secureInt = secureRandom.nextInt(100);\n        } catch (NoSuchAlgorithmException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u305f\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u751f\u6210<\/h3>\n\n\n\n<p>Java 8\u4ee5\u964d\u3067\u306f\u3001\u30b9\u30c8\u30ea\u30fc\u30e0API\u3092\u4f7f\u7528\u3057\u3066\u52b9\u7387\u7684\u306b\u4e71\u6570\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u751f\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class RandomStreamExample {\n    public static void main(String[] args) {\n        Random random = new Random();\n\n        \/\/ \u6574\u6570\u306e\u30e9\u30f3\u30c0\u30e0\u30b9\u30c8\u30ea\u30fc\u30e0\n        IntStream intStream = random.ints(5, 1, 7);  \/\/ 5\u500b\u306e1-6\u306e\u30b5\u30a4\u30b3\u30ed\u5024\n        intStream.forEach(System.out::println);\n\n        \/\/ \u5c0f\u6570\u306e\u30e9\u30f3\u30c0\u30e0\u30b9\u30c8\u30ea\u30fc\u30e0\n        DoubleStream doubleStream = random.doubles(10, 0, 1);\n        doubleStream.forEach(System.out::println);\n\n        \/\/ \u7121\u9650\u30b9\u30c8\u30ea\u30fc\u30e0\u304b\u3089\u306e\u53d6\u5f97\n        List&lt;Integer&gt; randomList = random.ints()\n            .limit(5)\n            .boxed()\n            .collect(Collectors.toList());\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30ab\u30b9\u30bf\u30e0\u7bc4\u56f2\u3067\u306e\u4e71\u6570\u751f\u6210\u624b\u6cd5<\/h3>\n\n\n\n<p>\u7279\u5b9a\u306e\u7bc4\u56f2\u3084\u5206\u5e03\u306e\u4e71\u6570\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u30ab\u30b9\u30bf\u30e0\u5b9f\u88c5\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CustomRangeRandomExample {\n    public static void main(String[] args) {\n        Random random = new Random();\n\n        \/\/ \u30ab\u30b9\u30bf\u30e0\u7bc4\u56f2\u306e\u6574\u6570\u3092\u751f\u6210\uff08min\u4ee5\u4e0amax\u4ee5\u4e0b\uff09\n        int min = 5;\n        int max = 10;\n        int customRange = random.nextInt((max - min) + 1) + min;\n\n        \/\/ \u30ac\u30a6\u30b9\u5206\u5e03\uff08\u6b63\u898f\u5206\u5e03\uff09\u306b\u5f93\u3046\u4e71\u6570\n        double gaussian = random.nextGaussian();\n\n        \/\/ \u30ab\u30b9\u30bf\u30e0\u78ba\u7387\u5206\u5e03\u306e\u5b9f\u88c5\u4f8b\n        int weightedRandom = getWeightedRandom(random);\n    }\n\n    \/\/ \u91cd\u307f\u4ed8\u3051\u78ba\u7387\u306b\u3088\u308b\u4e71\u6570\u751f\u6210\u306e\u4f8b\n    private static int getWeightedRandom(Random random) {\n        int[] values = {1, 2, 3, 4, 5};\n        double[] weights = {0.4, 0.3, 0.15, 0.1, 0.05}; \/\/ \u78ba\u7387\u306e\u91cd\u307f\n\n        double total = 0;\n        double r = random.nextDouble();\n\n        for (int i = 0; i &lt; weights.length; i++) {\n            total += weights[i];\n            if (r &lt;= total) {\n                return values[i];\n            }\n        }\n        return values[values.length - 1];\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30b7\u30fc\u30c9\u5024\u3092\u6d3b\u7528\u3057\u305f\u518d\u73fe\u53ef\u80fd\u306a\u4e71\u6570\u751f\u6210<\/h3>\n\n\n\n<p>\u30b7\u30fc\u30c9\u5024\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u540c\u3058\u4e71\u6570\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u518d\u73fe\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u30c6\u30b9\u30c8\u3084\u30c7\u30d0\u30c3\u30b0\u3067\u7279\u306b\u6709\u7528\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SeededRandomExample {\n    public static void main(String[] args) {\n        \/\/ \u30b7\u30fc\u30c9\u5024\u3092\u6307\u5b9a\u3057\u3066Random\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\n        long seed = 42L;\n        Random seededRandom = new Random(seed);\n\n        \/\/ \u540c\u3058\u30b7\u30fc\u30c9\u5024\u3067\u540c\u3058\u7d50\u679c\u3092\u5f97\u308b\n        for (int i = 0; i &lt; 3; i++) {\n            Random r = new Random(seed);\n            System.out.println(\"Sequence \" + (i + 1) + \": \" +\n                r.nextInt(100) + \", \" +\n                r.nextInt(100) + \", \" +\n                r.nextInt(100));\n        }\n\n        \/\/ \u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u7528\u306e\u4f8b\n        public static class RandomizedTest {\n            private Random random;\n\n            @Before\n            public void setUp() {\n                random = new Random(42L); \/\/ \u30c6\u30b9\u30c8\u306e\u518d\u73fe\u6027\u3092\u78ba\u4fdd\n            }\n\n            @Test\n            public void testRandomBehavior() {\n                \/\/ \u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\n            }\n        }\n    }\n}<\/pre>\n\n\n\n<p>\u5404\u30c6\u30af\u30cb\u30c3\u30af\u306e\u7279\u5fb4\u6bd4\u8f03\uff1a<\/p>\n\n\n<div id=\"id-1c45ae09-dde8-4b08-97a8-c457f04a4890\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30c6\u30af\u30cb\u30c3\u30af<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><th>\u7279\u5fb4<\/th><th>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/th><th>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u6027<\/th><\/tr><\/thead><tbody><tr><td>Random<\/td><td>\u4e00\u822c\u7684\u306a\u7528\u9014<\/td><td>\u6c4e\u7528\u7684\u3067\u4f7f\u3044\u3084\u3059\u3044<\/td><td>\u6a19\u6e96\u7684<\/td><td>Yes\uff08\u540c\u671f\u3042\u308a\uff09<\/td><\/tr><tr><td>Math.random<\/td><td>\u7c21\u5358\u306a\u5b9f\u88c5<\/td><td>\u6700\u3082\u30b7\u30f3\u30d7\u30eb<\/td><td>\u6a19\u6e96\u7684<\/td><td>Yes<\/td><\/tr><tr><td>ThreadLocalRandom<\/td><td>\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883<\/td><td>\u30b9\u30ec\u30c3\u30c9\u3054\u3068\u306b\u72ec\u7acb<\/td><td>\u9ad8<\/td><td>Yes\uff08\u540c\u671f\u306a\u3057\uff09<\/td><\/tr><tr><td>SecureRandom<\/td><td>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8981\u4ef6<\/td><td>\u6697\u53f7\u5b66\u7684\u306b\u5b89\u5168<\/td><td>\u4f4e<\/td><td>Yes<\/td><\/tr><tr><td>Stream API<\/td><td>\u5927\u91cf\u30c7\u30fc\u30bf\u751f\u6210<\/td><td>\u52b9\u7387\u7684\u306a\u51e6\u7406<\/td><td>\u9ad8<\/td><td>\u5b9f\u88c5\u4f9d\u5b58<\/td><\/tr><tr><td>\u30ab\u30b9\u30bf\u30e0\u7bc4\u56f2<\/td><td>\u7279\u5b9a\u8981\u4ef6\u5bfe\u5fdc<\/td><td>\u67d4\u8edf\u306a\u5b9f\u88c5\u53ef\u80fd<\/td><td>\u5b9f\u88c5\u4f9d\u5b58<\/td><td>\u5b9f\u88c5\u4f9d\u5b58<\/td><\/tr><tr><td>\u30b7\u30fc\u30c9\u5024\u6307\u5b9a<\/td><td>\u30c6\u30b9\u30c8\u30fb\u30c7\u30d0\u30c3\u30b0<\/td><td>\u518d\u73fe\u53ef\u80fd<\/td><td>\u6a19\u6e96\u7684<\/td><td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">3. \u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5225\u306e\u6700\u9069\u306a\u4e71\u6570\u751f\u6210\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u30b2\u30fc\u30e0\u958b\u767a\u3067\u306e\u4e71\u6570\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30b2\u30fc\u30e0\u958b\u767a\u3067\u306f\u3001\u4e88\u6e2c\u4e0d\u53ef\u80fd\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class GameRandomExample {\n    private final Random random;\n    private final ThreadLocalRandom threadRandom;\n\n    public GameRandomExample() {\n        this.random = new Random();\n        this.threadRandom = ThreadLocalRandom.current();\n    }\n\n    \/\/ \u30a2\u30a4\u30c6\u30e0\u30c9\u30ed\u30c3\u30d7\u306e\u78ba\u7387\u8a08\u7b97\n    public boolean calculateDrop(double dropRate) {\n        return random.nextDouble() &lt; dropRate;\n    }\n\n    \/\/ \u30c0\u30e1\u30fc\u30b8\u306e\u5909\u52d5\u8a08\u7b97\n    public int calculateDamage(int baseDamage) {\n        \/\/ \u57fa\u672c\u30c0\u30e1\u30fc\u30b8\u306e\u00b110%\u306e\u7bc4\u56f2\u3067\u5909\u52d5\n        double variation = 0.9 + (random.nextDouble() * 0.2);\n        return (int)(baseDamage * variation);\n    }\n\n    \/\/ \u30de\u30c3\u30d7\u751f\u6210\u7528\u306e\u4e71\u6570\u751f\u6210\uff08\u4e26\u5217\u51e6\u7406\u5bfe\u5fdc\uff09\n    public int[][] generateRandomMap(int width, int height) {\n        int[][] map = new int[height][width];\n        \/\/ \u4e26\u5217\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u3066\u9ad8\u901f\u306b\u5730\u5f62\u3092\u751f\u6210\n        IntStream.range(0, height).parallel().forEach(y -&gt; {\n            IntStream.range(0, width).forEach(x -&gt; {\n                map[y][x] = threadRandom.nextInt(0, 4); \/\/ 0-3\u306e\u5730\u5f62\u30bf\u30a4\u30d7\n            });\n        });\n        return map;\n    }\n}<\/pre>\n\n\n\n<p>\u30b2\u30fc\u30e0\u958b\u767a\u3067\u306e\u5b9f\u88c5\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9ad8\u901f\u306a\u4e71\u6570\u751f\u6210\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f<code>ThreadLocalRandom<\/code>\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u518d\u73fe\u6027\u304c\u5fc5\u8981\u306a\u5834\u9762\uff08\u30de\u30c3\u30d7\u751f\u6210\u306a\u3069\uff09\u3067\u306f\u30b7\u30fc\u30c9\u5024\u3092\u6d3b\u7528<\/li>\n\n\n\n<li>\u78ba\u7387\u8a08\u7b97\u306b\u306f<code>nextDouble()<\/code>\u3092\u4f7f\u7528\u3057\u3066\u7d30\u304b\u3044\u5236\u5fa1\u3092\u5b9f\u73fe<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u91cd\u8981\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8981\u4ef6\u306e\u9ad8\u3044\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001<code>SecureRandom<\/code>\u306e\u4f7f\u7528\u304c\u5fc5\u9808\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SecurityRandomExample {\n    private final SecureRandom secureRandom;\n\n    public SecurityRandomExample() {\n        try {\n            \/\/ \u3088\u308a\u5f37\u529b\u306a\u4e71\u6570\u751f\u6210\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u4f7f\u7528\n            this.secureRandom = SecureRandom.getInstanceStrong();\n        } catch (NoSuchAlgorithmException e) {\n            throw new RuntimeException(\"Failed to initialize SecureRandom\", e);\n        }\n    }\n\n    \/\/ \u30bb\u30ad\u30e5\u30a2\u306a\u30d1\u30b9\u30ef\u30fc\u30c9\u30bd\u30eb\u30c8\u751f\u6210\n    public byte[] generateSalt() {\n        byte[] salt = new byte[16];\n        secureRandom.nextBytes(salt);\n        return salt;\n    }\n\n    \/\/ \u30bb\u30c3\u30b7\u30e7\u30f3ID\u751f\u6210\n    public String generateSessionId() {\n        byte[] randomBytes = new byte[32];\n        secureRandom.nextBytes(randomBytes);\n        return Base64.getUrlEncoder().withoutPadding()\n                     .encodeToString(randomBytes);\n    }\n\n    \/\/ \u4e8c\u8981\u7d20\u8a8d\u8a3c\u7528\u306e\u30ef\u30f3\u30bf\u30a4\u30e0\u30d1\u30b9\u30ef\u30fc\u30c9\u751f\u6210\n    public String generateOTP() {\n        \/\/ 6\u6841\u306e\u6570\u5b57\u3092\u751f\u6210\n        return String.format(\"%06d\", secureRandom.nextInt(1000000));\n    }\n}<\/pre>\n\n\n\n<p>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u521d\u671f\u5316\u6642\u306e\u30b7\u30fc\u30c9\u5024\u306f\u81ea\u52d5\u751f\u6210\u3092\u5229\u7528<\/li>\n\n\n\n<li>\u5341\u5206\u306a\u9577\u3055\u306e\u30d0\u30a4\u30c8\u5217\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u4e88\u6e2c\u4e0d\u53ef\u80fd\u6027\u3092\u91cd\u8996\u3057\u305f\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u6027\u80fd\u304c\u8981\u6c42\u3055\u308c\u308b\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u9ad8\u6027\u80fd\u304c\u6c42\u3081\u3089\u308c\u308b\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u9069\u5207\u306a\u4e71\u6570\u751f\u6210\u65b9\u6cd5\u306e\u9078\u629e\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class HighPerformanceRandomExample {\n    private final ThreadLocalRandom threadRandom;\n    private final Random random;\n\n    public HighPerformanceRandomExample() {\n        this.threadRandom = ThreadLocalRandom.current();\n        this.random = new Random();\n    }\n\n    \/\/ \u4e26\u5217\u51e6\u7406\u3067\u306e\u5927\u91cf\u30c7\u30fc\u30bf\u751f\u6210\n    public List&lt;Double&gt; generateLargeDataset(int size) {\n        return threadRandom.doubles(size)\n                          .parallel()\n                          .boxed()\n                          .collect(Collectors.toList());\n    }\n\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u30d0\u30c3\u30c1\u51e6\u7406\n    public double[] generateRandomBatch(int batchSize) {\n        double[] batch = new double[batchSize];\n        for (int i = 0; i &lt; batchSize; i++) {\n            batch[i] = random.nextDouble();\n        }\n        return batch;\n    }\n\n    \/\/ \u9ad8\u901f\u306a\u7bc4\u56f2\u6307\u5b9a\u4e71\u6570\u751f\u6210\n    public int[] generateRandomRange(int size, int min, int max) {\n        return threadRandom.ints(size, min, max)\n                          .toArray();\n    }\n}<\/pre>\n\n\n\n<p>\u6027\u80fd\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\u306b\u3088\u308b\u52b9\u7387\u5316<\/li>\n\n\n\n<li><code>ThreadLocalRandom<\/code>\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30b9\u30c8\u30ea\u30fc\u30e0API\u306e\u4e26\u5217\u51e6\u7406\u6a5f\u80fd\u306e\u5229\u7528<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u306e\u9078\u629e<\/li>\n<\/ul>\n\n\n\n<p>\u5b9f\u88c5\u65b9\u6cd5\u306e\u9078\u629e\u57fa\u6e96\uff1a<\/p>\n\n\n<div id=\"id-315f37eb-778f-49f0-a7dc-bfcd26927304\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u8981\u4ef6<\/th><th>\u63a8\u5968\u5b9f\u88c5<\/th><th>\u7406\u7531<\/th><\/tr><\/thead><tbody><tr><td>\u9ad8\u6027\u80fd\u5fc5\u9808<\/td><td>ThreadLocalRandom<\/td><td>\u30b9\u30ec\u30c3\u30c9\u3054\u3068\u306e\u72ec\u7acb\u3057\u305f\u751f\u6210\u5668\u3067\u9ad8\u901f<\/td><\/tr><tr><td>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u91cd\u8996<\/td><td>SecureRandom<\/td><td>\u6697\u53f7\u5b66\u7684\u306b\u5b89\u5168\u306a\u4e71\u6570\u3092\u751f\u6210<\/td><\/tr><tr><td>\u30d0\u30e9\u30f3\u30b9\u578b<\/td><td>Random<\/td><td>\u4e00\u822c\u7684\u306a\u7528\u9014\u306b\u5341\u5206\u306a\u6027\u80fd\u3068\u5b89\u5168\u6027<\/td><\/tr><tr><td>\u958b\u767a\u52b9\u7387\u91cd\u8996<\/td><td>Math.random<\/td><td>\u30b7\u30f3\u30d7\u30eb\u3067\u4f7f\u3044\u3084\u3059\u3044<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"i-20\">4. \u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u7bc4\u56f2\u6307\u5b9a\u6642\u306e\u5178\u578b\u7684\u306a\u30df\u30b9\u3068\u5bfe\u7b56<\/h3>\n\n\n\n<p>\u4e71\u6570\u306e\u7bc4\u56f2\u6307\u5b9a\u3067\u767a\u751f\u3057\u3084\u3059\u3044\u554f\u984c\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-22\">1. \u7bc4\u56f2\u8a08\u7b97\u306e\u8aa4\u308a<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class RangeErrorExample {\n    public static void main(String[] args) {\n        Random random = new Random();\n\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\n        int incorrectDice = random.nextInt(6);    \/\/ 0-5\u306e\u5024\u306b\u306a\u3063\u3066\u3057\u307e\u3046\n\n        \/\/ \u6b63\u3057\u3044\u5b9f\u88c5\n        int correctDice = random.nextInt(6) + 1;  \/\/ 1-6\u306e\u5024\u306b\u306a\u308b\n\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u7bc4\u56f2\u6307\u5b9a\n        int incorrect = random.nextInt(10 - 5) + 5;  \/\/ 5-9\u306e\u7bc4\u56f2\u306b\u306a\u3063\u3066\u3057\u307e\u3046\n\n        \/\/ \u6b63\u3057\u3044\u7bc4\u56f2\u6307\u5b9a\n        int correct = random.nextInt(10 - 5 + 1) + 5;  \/\/ 5-10\u306e\u7bc4\u56f2\u306b\u306a\u308b\n    }\n\n    \/\/ \u7bc4\u56f2\u6307\u5b9a\u3092\u5b89\u5168\u306b\u884c\u3046\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\n    public static int getRandomInRange(Random random, int min, int max) {\n        if (min &gt;= max) {\n            throw new IllegalArgumentException(\"max must be greater than min\");\n        }\n        return random.nextInt((max - min) + 1) + min;\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-23\">2. \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7cbe\u5ea6\u554f\u984c<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class FloatingPointErrorExample {\n    public static void main(String[] args) {\n        Random random = new Random();\n\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\n        double incorrect = random.nextDouble() * 100;  \/\/ 99.99...\u307e\u3067\n\n        \/\/ \u6b63\u3057\u3044\u5b9f\u88c5\uff08\u6574\u6570\u5024\u304c\u5fc5\u8981\u306a\u5834\u5408\uff09\n        int correct = (int)(random.nextDouble() * 101);  \/\/ 0-100\n\n        \/\/ \u7bc4\u56f2\u6307\u5b9a\u4ed8\u304d\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u751f\u6210\n        double rangeDouble = getRandomDouble(random, 1.0, 5.0);\n    }\n\n    \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7bc4\u56f2\u6307\u5b9a\u3092\u9069\u5207\u306b\u884c\u3046\u30e1\u30bd\u30c3\u30c9\n    public static double getRandomDouble(Random random, double min, double max) {\n        return min + (random.nextDouble() * (max - min));\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">\u4e71\u6570\u306e\u504f\u308a\u304c\u767a\u751f\u3059\u308b\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-25\">1. \u30e2\u30b8\u30e5\u30ed\u30d0\u30a4\u30a2\u30b9\u306e\u554f\u984c<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class BiasExample {\n    public static void main(String[] args) {\n        Random random = new Random();\n\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\uff08\u30d0\u30a4\u30a2\u30b9\u304c\u767a\u751f\uff09\n        int biasedRandom = random.nextInt() % 6 + 1;\n\n        \/\/ \u6b63\u3057\u3044\u5b9f\u88c5\n        int unbiasedRandom = random.nextInt(6) + 1;\n\n        \/\/ \u30ab\u30b9\u30bf\u30e0\u7bc4\u56f2\u3067\u306e\u504f\u308a\u306e\u306a\u3044\u5b9f\u88c5\n        int customRange = getUnbiasedRandom(random, 1, 6);\n    }\n\n    \/\/ \u504f\u308a\u306e\u306a\u3044\u7bc4\u56f2\u6307\u5b9a\u4e71\u6570\u751f\u6210\n    public static int getUnbiasedRandom(Random random, int min, int max) {\n        int range = max - min + 1;\n        if (range &lt;= 0) {\n            throw new IllegalArgumentException(\"Invalid range\");\n        }\n\n        \/\/ 2\u306e\u3079\u304d\u4e57\u306b\u6700\u3082\u8fd1\u3044\u5024\u3092\u8a08\u7b97\n        int bits = Integer.highestOneBit(range);\n        int mask = bits | (bits - 1);\n\n        int result;\n        do {\n            result = random.nextInt() &amp; mask;\n        } while (result &gt;= range);\n\n        return result + min;\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-26\">2. \u30b7\u30fc\u30c9\u5024\u306e\u554f\u984c<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SeedingErrorExample {\n    public static void main(String[] args) {\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\uff08\u6bce\u56de\u540c\u3058\u30b7\u30fc\u30c9\u5024\uff09\n        Random badRandom = new Random(42);\n\n        \/\/ \u6642\u9593\u30d9\u30fc\u30b9\u306e\u30b7\u30fc\u30c9\u5024\u3082\u554f\u984c\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\n        Random timeBasedRandom = new Random(System.currentTimeMillis());\n\n        \/\/ \u63a8\u5968\u3055\u308c\u308b\u5b9f\u88c5\n        Random random = new Random();  \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f7f\u7528\n\n        \/\/ \u30c6\u30b9\u30c8\u7528\u306b\u30b7\u30fc\u30c9\u5024\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u660e\u793a\u7684\u306b\u8a18\u9332\n        long seed = System.nanoTime();\n        Random testRandom = new Random(seed);\n        System.out.println(\"Using seed: \" + seed);  \/\/ \u30c7\u30d0\u30c3\u30b0\u7528\u306b\u8a18\u9332\n    }\n}<\/pre>\n\n\n\n<p>\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3068\u305d\u306e\u5bfe\u7b56\u307e\u3068\u3081\uff1a<\/p>\n\n\n<div id=\"id-9b85fb2a-77ad-4892-8274-41404ac738d4\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30a8\u30e9\u30fc\u306e\u7a2e\u985e<\/th><th>\u539f\u56e0<\/th><th>\u5bfe\u7b56<\/th><\/tr><\/thead><tbody><tr><td>\u7bc4\u56f2\u8a08\u7b97\u30df\u30b9<\/td><td>\u5883\u754c\u5024\u306e\u8003\u616e\u4e0d\u8db3<\/td><td>\u7bc4\u56f2\u8a08\u7b97\u6642\u306b+1\u3092\u9069\u5207\u306b\u4f7f\u7528<\/td><\/tr><tr><td>\u7cbe\u5ea6\u306e\u554f\u984c<\/td><td>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7279\u6027<\/td><td>\u9069\u5207\u306a\u578b\u5909\u63db\u3068\u7bc4\u56f2\u6307\u5b9a<\/td><\/tr><tr><td>\u504f\u308a<\/td><td>\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u554f\u984c<\/td><td>\u9069\u5207\u306a\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528<\/td><\/tr><tr><td>\u30b7\u30fc\u30c9\u5024\u306e\u554f\u984c<\/td><td>\u4e88\u6e2c\u53ef\u80fd\u6027<\/td><td>\u7528\u9014\u306b\u5fdc\u3058\u305f\u521d\u671f\u5316\u65b9\u6cd5\u306e\u9078\u629e<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u4e88\u9632\u7684\u5bfe\u7b56\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\u306e\u4f5c\u6210\u3068\u518d\u5229\u7528<\/li>\n\n\n\n<li>\u5358\u4f53\u30c6\u30b9\u30c8\u3067\u306e\u5883\u754c\u5024\u30c1\u30a7\u30c3\u30af<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u306e\u6ce8\u610f\u6df1\u3044\u78ba\u8a8d<\/li>\n\n\n\n<li>\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u306e\u9069\u5207\u306a\u6d3b\u7528<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-27\">5. \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-28\">\u5404\u5b9f\u88c5\u65b9\u6cd5\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03<\/h3>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5404\u5b9f\u88c5\u65b9\u6cd5\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class RandomBenchmark {\n    private static final int ITERATIONS = 10_000_000;\n\n    public static void main(String[] args) {\n        \/\/ \u5404\u5b9f\u88c5\u65b9\u6cd5\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\n        benchmarkRandom();\n        benchmarkThreadLocalRandom();\n        benchmarkSecureRandom();\n        benchmarkMathRandom();\n    }\n\n    private static void benchmarkRandom() {\n        Random random = new Random();\n        long startTime = System.nanoTime();\n\n        for (int i = 0; i &lt; ITERATIONS; i++) {\n            random.nextInt(100);\n        }\n\n        printResults(\"Random\", startTime);\n    }\n\n    private static void benchmarkThreadLocalRandom() {\n        ThreadLocalRandom random = ThreadLocalRandom.current();\n        long startTime = System.nanoTime();\n\n        for (int i = 0; i &lt; ITERATIONS; i++) {\n            random.nextInt(100);\n        }\n\n        printResults(\"ThreadLocalRandom\", startTime);\n    }\n\n    private static void benchmarkSecureRandom() {\n        SecureRandom secureRandom = new SecureRandom();\n        long startTime = System.nanoTime();\n\n        for (int i = 0; i &lt; ITERATIONS; i++) {\n            secureRandom.nextInt(100);\n        }\n\n        printResults(\"SecureRandom\", startTime);\n    }\n\n    private static void benchmarkMathRandom() {\n        long startTime = System.nanoTime();\n\n        for (int i = 0; i &lt; ITERATIONS; i++) {\n            int value = (int)(Math.random() * 100);\n        }\n\n        printResults(\"Math.random\", startTime);\n    }\n\n    private static void printResults(String method, long startTime) {\n        long endTime = System.nanoTime();\n        long duration = (endTime - startTime) \/ 1_000_000; \/\/ \u30df\u30ea\u79d2\u306b\u5909\u63db\n        System.out.printf(\"%s: %d ms%n\", method, duration);\n    }\n}<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n<div id=\"id-ff3b74d9-eeb7-446a-bf70-97153548af88\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5b9f\u88c5\u65b9\u6cd5<\/th><th>\u76f8\u5bfe\u6027\u80fd<\/th><th>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/th><th>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u6027<\/th><\/tr><\/thead><tbody><tr><td>ThreadLocalRandom<\/td><td>\u6700\u901f<\/td><td>\u4e2d<\/td><td>\u6700\u9069<\/td><\/tr><tr><td>Random<\/td><td>\u901f\u3044<\/td><td>\u4f4e<\/td><td>\u8981\u540c\u671f<\/td><\/tr><tr><td>Math.random<\/td><td>\u4e2d\u7a0b\u5ea6<\/td><td>\u4f4e<\/td><td>\u8981\u540c\u671f<\/td><\/tr><tr><td>SecureRandom<\/td><td>\u9045\u3044<\/td><td>\u9ad8<\/td><td>\u8981\u540c\u671f<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-29\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3068\u5bfe\u7b56\u65b9\u6cd5<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class RandomSecurityExample {\n    private static final SecureRandom secureRandom;\n\n    static {\n        try {\n            \/\/ \u63a8\u5968\u3055\u308c\u308b\u521d\u671f\u5316\u65b9\u6cd5\n            secureRandom = SecureRandom.getInstanceStrong();\n        } catch (NoSuchAlgorithmException e) {\n            throw new SecurityException(\"Failed to initialize SecureRandom\", e);\n        }\n    }\n\n    \/\/ \u30bb\u30ad\u30e5\u30a2\u306a\u4e71\u6570\u751f\u6210\u5668\u306e\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\n    private static class SecureRandomHolder {\n        private static final SecureRandom INSTANCE = new SecureRandom();\n    }\n\n    \/\/ \u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30a2\u30af\u30bb\u30b9\u65b9\u6cd5\n    public static SecureRandom getSecureRandom() {\n        return SecureRandomHolder.INSTANCE;\n    }\n\n    \/\/ \u30bb\u30ad\u30e5\u30a2\u306a\u30c8\u30fc\u30af\u30f3\u751f\u6210\n    public static String generateSecureToken(int length) {\n        byte[] bytes = new byte[length];\n        secureRandom.nextBytes(bytes);\n        return Base64.getUrlEncoder().withoutPadding().encodeToString(bytes);\n    }\n\n    \/\/ \u30bb\u30ad\u30e5\u30a2\u306a\u7bc4\u56f2\u6307\u5b9a\u4e71\u6570\u751f\u6210\n    public static int getSecureRandomInRange(int min, int max) {\n        if (min &gt;= max) {\n            throw new IllegalArgumentException(\"max must be greater than min\");\n        }\n\n        \/\/ \u7bc4\u56f2\u306e\u30d3\u30c3\u30c8\u6570\u3092\u8a08\u7b97\n        int range = max - min + 1;\n        int bits = Integer.SIZE - Integer.numberOfLeadingZeros(range);\n        int mask = (1 &lt;&lt; bits) - 1;\n\n        int result;\n        do {\n            result = secureRandom.nextInt() &amp; mask;\n        } while (result &gt;= range);\n\n        return result + min;\n    }\n}<\/pre>\n\n\n\n<p>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e88\u6e2c\u53ef\u80fd\u6027\u306e\u6392\u9664<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b7\u30fc\u30c9\u5024\u306e\u9069\u5207\u306a\u7ba1\u7406<\/li>\n\n\n\n<li>\u6697\u53f7\u5b66\u7684\u306b\u5b89\u5168\u306a\u4e71\u6570\u751f\u6210\u5668\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>\u6642\u9593\u30d9\u30fc\u30b9\u306e\u30b7\u30fc\u30c9\u5024\u306e\u56de\u907f<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u521d\u671f\u5316<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u63a8\u5968\u3055\u308c\u306a\u3044\u65b9\u6cd5\nSecureRandom weak = new SecureRandom(\"fixed\".getBytes()); \/\/ \u56fa\u5b9a\u30b7\u30fc\u30c9\n\n\/\/ \u63a8\u5968\u3055\u308c\u308b\u65b9\u6cd5\nSecureRandom strong = SecureRandom.getInstanceStrong();<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306e\u78ba\u4fdd<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class EntropyExample {\n    public static void addEntropy(SecureRandom secureRandom) {\n        \/\/ \u30b7\u30b9\u30c6\u30e0\u306e\u72b6\u614b\u60c5\u5831\u3092\u8ffd\u52a0\n        long timestamp = System.nanoTime();\n        byte[] systemInfo = String.valueOf(timestamp).getBytes();\n        secureRandom.setSeed(systemInfo);\n\n        \/\/ \u5b9f\u884c\u6642\u306e\u60c5\u5831\u3092\u8ffd\u52a0\n        Runtime runtime = Runtime.getRuntime();\n        String runtimeInfo = String.format(\"%d-%d-%d\",\n            runtime.totalMemory(),\n            runtime.freeMemory(),\n            Thread.activeCount());\n        secureRandom.setSeed(runtimeInfo.getBytes());\n    }\n}<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/li>\n\n\n\n<li>[ ] \u9069\u5207\u306a\u5b9f\u88c5\u65b9\u6cd5\u306e\u9078\u629e<\/li>\n\n\n\n<li>[ ] \u30b9\u30ec\u30c3\u30c9\u5b89\u5168\u6027\u306e\u78ba\u8a8d<\/li>\n\n\n\n<li>[ ] \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>[ ] \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/li>\n\n\n\n<li>[ ] \u6697\u53f7\u5b66\u7684\u306b\u5b89\u5168\u306a\u4e71\u6570\u751f\u6210\u5668\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>[ ] \u9069\u5207\u306a\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li>[ ] \u30b7\u30fc\u30c9\u5024\u306e\u5b89\u5168\u306a\u7ba1\u7406<\/li>\n\n\n\n<li>[ ] \u5b9a\u671f\u7684\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u76e3\u67fb<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-30\">6. \u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u5fdc\u7528<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-31\">\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-32\">1. \u30e9\u30f3\u30c0\u30e0\u751f\u6210\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9<\/h4>\n\n\n\n<p>\u4ee5\u4e0b\u306f\u3001\u69d8\u3005\u306a\u7528\u9014\u306b\u5bfe\u5fdc\u3057\u305f\u6c4e\u7528\u7684\u306a\u30e9\u30f3\u30c0\u30e0\u751f\u6210\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class RandomUtils {\n    private static final Random random = new Random();\n    private static final SecureRandom secureRandom = new SecureRandom();\n    private static final ThreadLocalRandom threadRandom = ThreadLocalRandom.current();\n\n    \/\/ \u6587\u5b57\u7a2e\u5225\u306e\u5b9a\u7fa9\n    private static final String LOWER = \"abcdefghijklmnopqrstuvwxyz\";\n    private static final String UPPER = \"ABCDEFGHIJKLMNOPQRSTUVWXYZ\";\n    private static final String DIGITS = \"0123456789\";\n    private static final String SPECIAL = \"!@#$%^&amp;*()_+-=[]{}|;:,.&lt;&gt;?\";\n\n    \/\/ \u30e9\u30f3\u30c0\u30e0\u306a\u6587\u5b57\u5217\u751f\u6210\n    public static String generateRandomString(int length, boolean includeLower,\n                                           boolean includeUpper, boolean includeDigits,\n                                           boolean includeSpecial) {\n        StringBuilder chars = new StringBuilder();\n        if (includeLower) chars.append(LOWER);\n        if (includeUpper) chars.append(UPPER);\n        if (includeDigits) chars.append(DIGITS);\n        if (includeSpecial) chars.append(SPECIAL);\n\n        if (chars.length() == 0) {\n            throw new IllegalArgumentException(\"At least one character set must be selected\");\n        }\n\n        return threadRandom.ints(length, 0, chars.length())\n                          .mapToObj(i -&gt; String.valueOf(chars.charAt(i)))\n                          .collect(Collectors.joining());\n    }\n\n    \/\/ \u91cd\u307f\u4ed8\u304d\u9078\u629e\u306e\u5b9f\u88c5\n    public static &lt;T&gt; T weightedChoice(Map&lt;T, Double&gt; weightMap) {\n        double totalWeight = weightMap.values().stream()\n                                    .mapToDouble(Double::doubleValue)\n                                    .sum();\n\n        double randomValue = random.nextDouble() * totalWeight;\n        double currentWeight = 0.0;\n\n        for (Map.Entry&lt;T, Double&gt; entry : weightMap.entrySet()) {\n            currentWeight += entry.getValue();\n            if (randomValue &lt;= currentWeight) {\n                return entry.getKey();\n            }\n        }\n\n        return weightMap.keySet().iterator().next(); \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\n    }\n\n    \/\/ \u30e9\u30f3\u30c0\u30e0\u306a\u65e5\u4ed8\u751f\u6210\n    public static LocalDate randomDate(LocalDate startInclusive, LocalDate endExclusive) {\n        long startEpochDay = startInclusive.toEpochDay();\n        long endEpochDay = endExclusive.toEpochDay();\n        long randomDay = threadRandom.nextLong(startEpochDay, endEpochDay);\n        return LocalDate.ofEpochDay(randomDay);\n    }\n\n    \/\/ \u30b7\u30e3\u30c3\u30d5\u30eb\u51e6\u7406\u306e\u5b9f\u88c5\n    public static &lt;T&gt; List&lt;T&gt; shuffle(List&lt;T&gt; list) {\n        List&lt;T&gt; shuffled = new ArrayList&lt;&gt;(list);\n        for (int i = shuffled.size() - 1; i &gt; 0; i--) {\n            int j = random.nextInt(i + 1);\n            T temp = shuffled.get(i);\n            shuffled.set(i, shuffled.get(j));\n            shuffled.set(j, temp);\n        }\n        return shuffled;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-33\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u306e\u4e71\u6570\u306e\u6271\u3044\u65b9<\/h3>\n\n\n\n<p>\u4e71\u6570\u3092\u4f7f\u7528\u3059\u308b\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8\u306f\u3001\u518d\u73fe\u6027\u3068\u4fe1\u983c\u6027\u306e\u78ba\u4fdd\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class RandomTest {\n    private Random random;\n    private long seed;\n\n    @Before\n    public void setUp() {\n        \/\/ \u30c6\u30b9\u30c8\u306e\u518d\u73fe\u6027\u306e\u305f\u3081\u306b\u56fa\u5b9a\u30b7\u30fc\u30c9\u3092\u4f7f\u7528\n        seed = 42L;\n        random = new Random(seed);\n    }\n\n    @Test\n    public void testRandomRange() {\n        int min = 1;\n        int max = 10;\n        Set&lt;Integer&gt; generated = new HashSet&lt;&gt;();\n\n        \/\/ \u5341\u5206\u306a\u56de\u6570\u306e\u8a66\u884c\u3092\u884c\u3046\n        for (int i = 0; i &lt; 1000; i++) {\n            int value = min + random.nextInt(max - min + 1);\n            generated.add(value);\n\n            \/\/ \u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\n            assertTrue(value &gt;= min &amp;&amp; value &lt;= max);\n        }\n\n        \/\/ \u5341\u5206\u306a\u30ab\u30d0\u30ec\u30c3\u30b8\u306e\u78ba\u8a8d\n        assertEquals(max - min + 1, generated.size());\n    }\n\n    @Test\n    public void testDistribution() {\n        int[] counts = new int[6]; \/\/ \u30b5\u30a4\u30b3\u30ed\u306e\u76ee\u306e\u51fa\u73fe\u56de\u6570\n        int trials = 60000;\n\n        \/\/ \u5206\u5e03\u306e\u78ba\u8a8d\n        for (int i = 0; i &lt; trials; i++) {\n            int value = random.nextInt(6);\n            counts++;\n        }\n\n        \/\/ \u30ab\u30a4\u4e8c\u4e57\u691c\u5b9a\u306e\u5b9f\u88c5\u4f8b\n        double expectedCount = trials \/ 6.0;\n        double chiSquare = 0.0;\n\n        for (int count : counts) {\n            chiSquare += Math.pow(count - expectedCount, 2) \/ expectedCount;\n        }\n\n        \/\/ \u81ea\u7531\u5ea65\u3001\u6709\u610f\u6c34\u6e965%\u3067\u306e\u30ab\u30a4\u4e8c\u4e57\u5024\u306f11.07\n        assertTrue(chiSquare &lt; 11.07);\n    }\n\n    @Test\n    public void testMocking() {\n        \/\/ \u30e2\u30c3\u30af\u3092\u4f7f\u7528\u3057\u305f\u30c6\u30b9\u30c8\u4f8b\n        Random mockRandom = mock(Random.class);\n        when(mockRandom.nextInt(anyInt())).thenReturn(42);\n\n        \/\/ \u30c6\u30b9\u30c8\u5bfe\u8c61\u306e\u30af\u30e9\u30b9\n        class RandomUser {\n            private final Random random;\n\n            public RandomUser(Random random) {\n                this.random = random;\n            }\n\n            public int getRandomValue() {\n                return random.nextInt(100);\n            }\n        }\n\n        RandomUser randomUser = new RandomUser(mockRandom);\n        assertEquals(42, randomUser.getRandomValue());\n    }\n}<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u3068\u30c6\u30b9\u30c8\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e71\u6570\u751f\u6210\u306e\u62bd\u8c61\u5316<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface RandomGenerator {\n    int nextInt(int bound);\n    double nextDouble();\n    \/\/ \u4ed6\u306e\u30e1\u30bd\u30c3\u30c9\n}\n\npublic class DefaultRandomGenerator implements RandomGenerator {\n    private final Random random = new Random();\n\n    @Override\n    public int nextInt(int bound) {\n        return random.nextInt(bound);\n    }\n\n    @Override\n    public double nextDouble() {\n        return random.nextDouble();\n    }\n}\n\npublic class TestRandomGenerator implements RandomGenerator {\n    private final Random random;\n\n    public TestRandomGenerator(long seed) {\n        this.random = new Random(seed);\n    }\n\n    @Override\n    public int nextInt(int bound) {\n        return random.nextInt(bound);\n    }\n\n    @Override\n    public double nextDouble() {\n        return random.nextDouble();\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u4f9d\u5b58\u6027\u6ce8\u5165\u306e\u6d3b\u7528<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class GameLogic {\n    private final RandomGenerator random;\n\n    public GameLogic(RandomGenerator random) {\n        this.random = random;\n    }\n\n    public int rollDice() {\n        return random.nextInt(6) + 1;\n    }\n}\n\n\/\/ \u30c6\u30b9\u30c8\u3067\u306e\u4f7f\u7528\u4f8b\n@Test\npublic void testGameLogic() {\n    RandomGenerator testRandom = new TestRandomGenerator(42L);\n    GameLogic game = new GameLogic(testRandom);\n    int result = game.rollDice();\n    \/\/ \u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\n}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-34\">7. \u307e\u3068\u3081\u3068\u6b21\u306e\u30b9\u30c6\u30c3\u30d7<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-35\">\u7528\u9014\u5225\u304a\u3059\u3059\u3081\u306e\u5b9f\u88c5\u65b9\u6cd5\u307e\u3068\u3081<\/h3>\n\n\n\n<p>Java\u306b\u304a\u3051\u308b\u4e71\u6570\u751f\u6210\u306e\u5b9f\u88c5\u65b9\u6cd5\u306f\u3001\u7528\u9014\u306b\u3088\u3063\u3066\u9069\u5207\u306a\u9078\u629e\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u4e3b\u8981\u306a\u7528\u9014\u5225\u306e\u63a8\u5968\u5b9f\u88c5\u3092\u307e\u3068\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-36\">\u4e00\u822c\u7684\u306a\u7528\u9014\u3067\u306e\u63a8\u5968\u5b9f\u88c5<\/h4>\n\n\n<div id=\"id-df716061-5377-49f1-a886-875806f2c224\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7528\u9014<\/th><th>\u63a8\u5968\u30af\u30e9\u30b9<\/th><th>\u4e3b\u306a\u7406\u7531<\/th><\/tr><\/thead><tbody><tr><td>\u4e00\u822c\u7684\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/td><td>Random<\/td><td>\u30d0\u30e9\u30f3\u30b9\u306e\u53d6\u308c\u305f\u6027\u80fd\u3068\u4f7f\u3044\u3084\u3059\u3055<\/td><\/tr><tr><td>\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883<\/td><td>ThreadLocalRandom<\/td><td>\u512a\u308c\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u6027<\/td><\/tr><tr><td>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8981\u4ef6\u3042\u308a<\/td><td>SecureRandom<\/td><td>\u6697\u53f7\u5b66\u7684\u306a\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/td><\/tr><tr><td>\u7c21\u5358\u306a\u5b9f\u88c5<\/td><td>Math.random<\/td><td>\u30b7\u30f3\u30d7\u30eb\u306a\u4f7f\u7528\u65b9\u6cd5<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\" id=\"i-37\">\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\u5225\u306e\u5b9f\u88c5\u4f8b<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b2\u30fc\u30e0\u958b\u767a\u3067\u306e\u5b9f\u88c5<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class GameRandomImplementation {\n    private final ThreadLocalRandom random = ThreadLocalRandom.current();\n\n    \/\/ \u9ad8\u901f\u306a\u4e71\u6570\u751f\u6210\u304c\u5fc5\u8981\u306a\u5834\u5408\n    public int getQuickRandom(int min, int max) {\n        return random.nextInt(min, max + 1);\n    }\n\n    \/\/ \u518d\u73fe\u6027\u304c\u5fc5\u8981\u306a\u5834\u5408\n    public static class ReproducibleRandom {\n        private final Random seededRandom;\n\n        public ReproducibleRandom(long seed) {\n            this.seededRandom = new Random(seed);\n        }\n\n        public int getReproducibleRandom(int min, int max) {\n            return min + seededRandom.nextInt(max - min + 1);\n        }\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u91cd\u8996\u306e\u5b9f\u88c5<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SecurityRandomImplementation {\n    private static final SecureRandom secureRandom = new SecureRandom();\n\n    \/\/ \u30c8\u30fc\u30af\u30f3\u751f\u6210\n    public static String generateToken() {\n        byte[] bytes = new byte[32];\n        secureRandom.nextBytes(bytes);\n        return Base64.getUrlEncoder().withoutPadding()\n                     .encodeToString(bytes);\n    }\n}<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u9ad8\u6027\u80fd\u8981\u4ef6\u306e\u5b9f\u88c5<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class HighPerformanceRandomImplementation {\n    private static final ThreadLocalRandom random = ThreadLocalRandom.current();\n\n    \/\/ \u4e26\u5217\u51e6\u7406\u3067\u306e\u4f7f\u7528\n    public List&lt;Integer&gt; generateParallelRandoms(int count) {\n        return random.ints(count)\n                    .parallel()\n                    .boxed()\n                    .collect(Collectors.toList());\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-38\">\u4eca\u5f8c\u306e\u5b66\u7fd2\u306e\u305f\u3081\u306e\u30ea\u30bd\u30fc\u30b9\u7d39\u4ecb<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-39\">1. \u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Java API Documentation<\/li>\n\n\n\n<li>java.util.Random<\/li>\n\n\n\n<li>java.util.concurrent.ThreadLocalRandom<\/li>\n\n\n\n<li>java.security.SecureRandom<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-40\">2. \u63a8\u5968\u66f8\u7c4d<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cEffective Java\u201d by Joshua Bloch<\/li>\n\n\n\n<li>\u4e71\u6570\u751f\u6210\u3092\u542b\u3080Java\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/li>\n\n\n\n<li>\u201cJava Concurrency in Practice\u201d<\/li>\n\n\n\n<li>\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u4e71\u6570\u751f\u6210\u306b\u3064\u3044\u3066<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-41\">3. \u767a\u5c55\u7684\u306a\u30c8\u30d4\u30c3\u30af<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6697\u53f7\u5b66\u7684\u4e71\u6570\u751f\u6210\u5668\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u5206\u5e03\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u9ad8\u5ea6\u306a\u7d71\u8a08\u7684\u30c6\u30b9\u30c8\u624b\u6cd5<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u6280\u8853<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-42\">4. \u5b9f\u8df5\u7684\u306a\u5b66\u7fd2\u30b9\u30c6\u30c3\u30d7<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u57fa\u790e\u306e\u78ba\u7acb<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u57fa\u672c\u7684\u306a\u4e71\u6570\u751f\u6210\u306e\u7406\u89e3<\/li>\n\n\n\n<li>\u5404\u30af\u30e9\u30b9\u306e\u7279\u5fb4\u306e\u628a\u63e1<\/li>\n\n\n\n<li>\u5358\u7d14\u306a\u5b9f\u88c5\u7df4\u7fd2<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5fdc\u7528\u529b\u306e\u5411\u4e0a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ab\u30b9\u30bf\u30e0\u5b9f\u88c5\u306e\u4f5c\u6210<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u624b\u6cd5\u306e\u7fd2\u5f97<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5c02\u9580\u77e5\u8b58\u306e\u7372\u5f97<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8003\u616e\u4e8b\u9805\u306e\u7406\u89e3<\/li>\n\n\n\n<li>\u7d71\u8a08\u7684\u6027\u8cea\u306e\u5b66\u7fd2<\/li>\n\n\n\n<li>\u9ad8\u5ea6\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u7814\u7a76<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5b9f\u52d9\u30b9\u30ad\u30eb\u306e\u78ba\u7acb<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u5b9f\u65bd<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6e2c\u5b9a\u3068\u6700\u9069\u5316<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-43\">5. \u30aa\u30f3\u30e9\u30a4\u30f3\u30ea\u30bd\u30fc\u30b9<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>GitHub: \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3068\u30e9\u30a4\u30d6\u30e9\u30ea<\/li>\n\n\n\n<li>Stack Overflow: \u5b9f\u8df5\u7684\u306a\u8cea\u554f\u3068\u56de\u7b54<\/li>\n\n\n\n<li>Java Community Process: \u4ed5\u69d8\u3068\u6a19\u6e96\u5316<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u6bb5\u968e\u7684\u306a\u5b66\u7fd2\u30a2\u30d7\u30ed\u30fc\u30c1\u306b\u3088\u308a\u3001\u4e71\u6570\u751f\u6210\u306b\u95a2\u3059\u308b\u7dcf\u5408\u7684\u306a\u7406\u89e3\u3068\u5b9f\u88c5\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; 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