{"id":400,"date":"2023-01-01T18:10:13","date_gmt":"2022-07-11T11:25:14","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%82%b8%e3%83%a3%e3%83%90%e3%81%ae%e3%83%a9%e3%83%b3%e3%83%80%e3%83%a0\/"},"modified":"2025-07-31T23:17:39","modified_gmt":"2025-07-31T14:17:39","slug":"%e3%82%b8%e3%83%a3%e3%83%90%e3%81%ae%e3%83%a9%e3%83%b3%e3%83%80%e3%83%a0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%82%b8%e3%83%a3%e3%83%90%e3%81%ae%e3%83%a9%e3%83%b3%e3%83%80%e3%83%a0\/","title":{"rendered":"\u30b8\u30e3\u30d0\u306e\u30e9\u30f3\u30c0\u30e0"},"content":{"rendered":"<p>Java\u306eRandom\u30af\u30e9\u30b9\u306f\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u306e\u30b7\u30ea\u30fc\u30ba\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>Java\u306eRandom\u30af\u30e9\u30b9<\/h2>\n<ul class=\"post-ul\">\n<li>Random class is part of java.util package.<\/li>\n<li>An instance of java Random class is used to generate random numbers.<\/li>\n<li>This class provides several methods to generate random numbers of type integer, double, long, float etc.<\/li>\n<li>Random number generation algorithm works on the seed value. If not provided, seed value is created from system nano time.<\/li>\n<li>If two Random instances have same seed value, then they will generate same sequence of random numbers.<\/li>\n<li>Java Random class is thread-safe, however in multithreaded environment it\u2019s advised to use java.util.concurrent.ThreadLocalRandom class.<\/li>\n<li>Random class instances are not suitable for security sensitive applications, better to use java.security.SecureRandom in those cases.<\/li>\n<\/ul>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648bf0daa94e2bdf7bc322\/3-0.png\" alt=\"Java Random Class, Random Class in Java\" \/><\/div>\n<h3>Java\u306e\u30e9\u30f3\u30c0\u30e0\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/h3>\n<p>Java\u306eRandom\u30af\u30e9\u30b9\u306b\u306f\u3001\u4ee5\u4e0b\u306b\u793a\u30592\u3064\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Random(): \u65b0\u3057\u3044\u4e71\u6570\u751f\u6210\u5668\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>Random(long seed): \u6307\u5b9a\u3055\u308c\u305f\u30b7\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u65b0\u3057\u3044\u4e71\u6570\u751f\u6210\u5668\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/ol>\n<h3>Java\u306eRandom\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9<\/h3>\n<p>Java\u306eRandom\u30af\u30e9\u30b9\u306e\u3044\u304f\u3064\u304b\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>nextBoolean(): \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u30fc\u30b7\u30fc\u30b1\u30f3\u30b9\u304b\u3089\u30d6\u30fc\u30eb\u5024\u3068\u3057\u3066\u306e\u507d\u306e\u6b21\u306e\u64ec\u4f3c\u4e71\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>nextDouble(): \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u30010.0\u304b\u30891.0\u306e\u9593\u306e\u64ec\u4f3c\u4e71\u6570\u3068\u3057\u3066\u6b21\u306e\u507d\u306e\u500d\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>nextFloat(): \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u30010.0\u304b\u30891.0\u306e\u9593\u306e\u64ec\u4f3c\u4e71\u6570\u3068\u3057\u3066\u6b21\u306e\u507d\u306e\u5358\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>nextInt(): \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u30fc\u30b7\u30fc\u30b1\u30f3\u30b9\u304b\u3089\u6b21\u306e\u6574\u6570\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>nextInt(int n): \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u30fc\u30b7\u30fc\u30b1\u30f3\u30b9\u304b\u30890\u304b\u3089\u6307\u5b9a\u3055\u308c\u305f\u5024\u307e\u3067\u306e\u7bc4\u56f2\u306e\u507d\u306e\u6574\u6570\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/ol>\n<h3>\u4f8b\u6587:<br \/>\n&#8220;Java\u306eRandom\u306e\u4f7f\u7528\u4f8b&#8221;<\/h3>\n<p>\u4ee5\u4e0b\u306eJava\u306eRandom\u306e\u4f8b\u984c\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.examples;\r\n\r\nimport java.util.Random;\r\n\r\n\/**\r\n * Java Random Number Example Program\r\n * \r\n *\/\r\npublic class RandomNumberExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\t\/\/initialize random number generator\r\n\t\tRandom random = new Random();\r\n\t\t\r\n\t\t\/\/generates boolean value\r\n\t\tSystem.out.println(random.nextBoolean());\r\n\t\t\r\n\t\t\/\/generates double value\r\n\t\tSystem.out.println(random.nextDouble());\r\n\t\t\r\n\t\t\/\/generates float value\r\n\t\tSystem.out.println(random.nextFloat());\r\n\t\t\r\n\t\t\/\/generates int value\r\n\t\tSystem.out.println(random.nextInt());\r\n\t\t\r\n\t\t\/\/generates int value within specific limit\r\n\t\tSystem.out.println(random.nextInt(20));\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code>false\r\n0.30986869120562854\r\n0.6210066\r\n-1348425743\r\n18\r\n<\/code><\/pre>\n<p>Java\u306e\u4e71\u6570\u751f\u6210\u306b\u3064\u3044\u3066\u306e\u8a73\u7d30\u306f\u3001\u3053\u306e\u6295\u7a3f\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>\u30b7\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5b57\u3092\u751f\u6210\u3059\u308b\u3002<\/h3>\n<p>\u30b7\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5b57\u3092\u751f\u6210\u3059\u308b\u65b9\u6cd5\u306f2\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>Random random = new Random(long seed);\r\n                         \r\nRandom random1 = new Random();\r\nrandom1.setSeed(seed);\r\n<\/code><\/pre>\n<p>\u30e1\u30bd\u30c3\u30c9next\uff08int\uff09\u306b\u3088\u3063\u3066\u7dad\u6301\u3055\u308c\u308b\u7591\u4f3c\u4e71\u6570\u751f\u6210\u5668\u306e\u5185\u90e8\u72b6\u614b\u306e\u521d\u671f\u5024\u306f\u30b7\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.examples;\r\n\r\nimport java.util.Random;\r\n\r\n\/**\r\n * Java Random Number Using Seed Example Program\r\n * \r\n * @author scdev\r\n *\r\n *\/\r\npublic class RadomSeedExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\t\/\/using constructor\r\n\t\tRandom random = new Random(100);\r\n\t\tSystem.out.println(\"Using Constructor\");\r\n\t\tSystem.out.println(random.nextInt());\r\n\t\t\r\n\t\t\/\/using method\r\n\t\tRandom random2 = new Random();\r\n\t\trandom2.setSeed(200);\r\n\t\tSystem.out.println(\"Using Method\");\r\n\t\tSystem.out.println(random2.nextInt());\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>Using Constructor\r\n-1193959466\r\nUsing Method\r\n-1133938638\r\n<\/code><\/pre>\n<p>\u3082\u3057\u540c\u3058\u30b7\u30fc\u30c9\u3092\u4e8c\u3064\u306e\u7570\u306a\u308b\u4e71\u6570\u751f\u6210\u5668\u306b\u6e21\u3057\u305f\u3089\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\uff1f\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u3001\u540c\u3058\u30b7\u30fc\u30c9\u3092\u4e8c\u3064\u306e\u7570\u306a\u308b\u4e71\u6570\u751f\u6210\u5668\u306b\u6e21\u3057\u305f\u5834\u5408\u306b\u4f55\u304c\u8d77\u3053\u308b\u304b\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.examples;\r\n\r\nimport java.util.Random;\r\n\r\n\/**\r\n * Java Random Number Using Same Seed Example Program\r\n * \r\n *\/\r\npublic class RandomNumberSameSeedExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\t\/\/initialize two random number generators using same seed\r\n\t\tRandom random1 = new Random(100);\r\n\t\tRandom random2 = new Random(100);\r\n\t\t\r\n\t\tSystem.out.println(random1.nextInt());\r\n\t\tSystem.out.println(random2.nextInt());\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>-1193959466\r\n-1193959466\r\n<\/code><\/pre>\n<p>\u3082\u3057\u540c\u3058\u30b7\u30fc\u30c9\u5024\u3092\u4e8c\u3064\u306e\u7570\u306a\u308b\u4e71\u6570\u751f\u6210\u5668\u306b\u6e21\u3059\u3068\u3001\u540c\u3058\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u304c\u751f\u6210\u3055\u308c\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3>Java 8\u306eRandom\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9<\/h3>\n<p>\u4e0a\u306e\u753b\u50cf\u304b\u3089\u5206\u304b\u308b\u3088\u3046\u306b\u3001Java 8\u3067\u306fRandom\u30af\u30e9\u30b9\u306b\u591a\u304f\u306e\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f1\u304b\u3089100\u306e\u7bc4\u56f2\u30675\u3064\u306e\u6574\u6570\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u751f\u6210\u3059\u308b\u7c21\u5358\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.random;\r\n\r\nimport java.util.Random;\r\nimport java.util.stream.IntStream;\r\n\r\npublic class JavaRandomExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tRandom random = new Random();\r\n\r\n\t\t\/\/ generate stream of 5 ints between 1 to 100\r\n\t\tIntStream ints = random.ints(5, 1, 100);\r\n\r\n\t\tints.forEach(System.out::println);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648bf0daa94e2bdf7bc322\/31-0.png\" alt=\"java random number, java random int stream\" \/><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eRandom\u30af\u30e9\u30b9\u306f\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u306e\u30b7\u30ea\u30fc\u30ba\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 Java\u306eRandom\u30af\u30e9\u30b9 Random class is part of java.util package. An instan [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-400","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u30b8\u30e3\u30d0\u306e\u30e9\u30f3\u30c0\u30e0 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u30b8\u30e3\u30d0\u306e\u30e9\u30f3\u30c0\u30e0\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/\u30b8\u30e3\u30d0\u306e\u30e9\u30f3\u30c0\u30e0\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u30b8\u30e3\u30d0\u306e\u30e9\u30f3\u30c0\u30e0\" \/>\n<meta property=\"og:description\" content=\"\u30b8\u30e3\u30d0\u306e\u30e9\u30f3\u30c0\u30e0\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/\u30b8\u30e3\u30d0\u306e\u30e9\u30f3\u30c0\u30e0\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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