{"id":314,"date":"2023-07-02T16:44:38","date_gmt":"2023-04-01T07:55:55","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%82%b8%e3%83%a3%e3%83%b4%e3%82%a1%e3%81%a7%e3%81%ae%e3%83%a9%e3%83%b3%e3%83%80%e3%83%a0%e6%95%b0%e5%ad%97%e7%94%9f%e6%88%90%e5%99%a8\/"},"modified":"2025-07-31T22:35:30","modified_gmt":"2025-07-31T13:35:30","slug":"%e3%82%b8%e3%83%a3%e3%83%b4%e3%82%a1%e3%81%a7%e3%81%ae%e3%83%a9%e3%83%b3%e3%83%80%e3%83%a0%e6%95%b0%e5%ad%97%e7%94%9f%e6%88%90%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%82%b8%e3%83%a3%e3%83%b4%e3%82%a1%e3%81%a7%e3%81%ae%e3%83%a9%e3%83%b3%e3%83%80%e3%83%a0%e6%95%b0%e5%ad%97%e7%94%9f%e6%88%90%e5%99%a8\/","title":{"rendered":"\u30b8\u30e3\u30f4\u30a1\u3067\u306e\u30e9\u30f3\u30c0\u30e0\u6570\u5b57\u751f\u6210\u5668"},"content":{"rendered":"

\u4eca\u65e5\u306f\u3001Java\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u3092\u751f\u6210\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002Java\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u3092\u751f\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30b5\u30a4\u30b3\u30ed\u306e\u30b2\u30fc\u30e0\u3084\u6697\u53f7\u5316\u306e\u305f\u3081\u306e\u30e9\u30f3\u30c0\u30e0\u306a\u9375ID\u306e\u751f\u6210\u306a\u3069\u3067\u3059\u3002<\/p>\n

Java\u3067\u306e\u4e71\u6570\u751f\u6210\u5668<\/h2>\n
\"random<\/div>\n
    \n
  1. \n
      java.util.Random\u30af\u30e9\u30b9\u306f\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30e9\u30f3\u30c0\u30e0\u306a\u6574\u6570\u3001\u9577\u6574\u6570\u3001\u500d\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306a\u3069\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u3044\u304f\u3064\u304b\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          Math.random()\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3082\u500d\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u5185\u90e8\u7684\u306bJava Random\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \n
          1. \n
              java.util.concurrent.ThreadLocalRandom\u30af\u30e9\u30b9\u306f\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u751f\u6210\u306b\u4f7f\u7528\u3059\u308b\u3079\u304d\u3067\u3059\u3002\u3053\u306e\u30af\u30e9\u30b9\u306fJava Concurrent\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u4e00\u90e8\u3067\u3042\u308a\u3001Java 1.7\u3067\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30af\u30e9\u30b9\u306b\u306fJava Random\u30af\u30e9\u30b9\u3068\u4f3c\u305f\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n

               <\/p>\n

                java.security.SecureRandom\u306f\u5f37\u529b\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u6301\u3064\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30af\u30e9\u30b9\u306f\u6697\u53f7\u7684\u306b\u5f37\u529b\u306a\u4e71\u6570\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u51e6\u7406\u901f\u5ea6\u304c\u9045\u3044\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u4f7f\u7528\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/ol>\n

                Java\u306e\u4e71\u6570\u751f\u6210\u5668<\/h2>\n

                \u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u898b\u3066\u3001Java\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u3092\u751f\u6210\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u305d\u306e\u5f8c\u3001ThreadLocalRandom\u3068SecureRandom\u306e\u4f8b\u30d7\u30ed\u30b0\u30e9\u30e0\u3082\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

                1. \u30e9\u30f3\u30c0\u30e0\u306a\u6574\u6570\u3092\u751f\u6210\u3059\u308b<\/h3>\n
                Random random = new Random();\r\n\r\nint rand = random.nextInt();\r\n<\/code><\/pre>\n
                \u306f\u3044\u3001Java\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u6574\u6570\u3092\u751f\u6210\u3059\u308b\u306e\u306f\u305d\u308c\u307b\u3069\u7c21\u5358\u3067\u3059\u3002Random\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3068\u3001\u3059\u3079\u3066\u306enextXXX\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3067\u4f7f\u7528\u3055\u308c\u308b\u9577\u3044\u30b7\u30fc\u30c9\u5024\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30b7\u30fc\u30c9\u5024\u3092\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
                \/\/set the long seed value using Random constructor\r\nRandom random = new Random(123456789);\r\n\r\n\/\/set long seed value using setter method\r\nRandom random1 = new Random();\r\nrandom1.setSeed(1234567890);\r\n<\/code><\/pre>\n
                2. 1\u304b\u308910\u307e\u3067\u306e\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u3092Java\u3067\u751f\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
                \u6642\u3005\u3001\u79c1\u305f\u3061\u306f\u7bc4\u56f2\u5185\u306e\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5b57\u3092\u751f\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30b5\u30a4\u30b3\u30ed\u306e\u30b2\u30fc\u30e0\u3067\u306f\u53ef\u80fd\u306a\u5024\u306f1\u304b\u30896\u307e\u3067\u306e\u307f\u3067\u3059\u3002\u4ee5\u4e0b\u306f\u30011\u304b\u308910\u307e\u3067\u306e\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5b57\u3092\u751f\u6210\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u305f\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
                Random random = new Random();\r\nint rand = 0;\r\nwhile (true){\r\n    rand = random.nextInt(11);\r\n    if(rand !=0) break;\r\n}\r\nSystem.out.println(rand);\r\n<\/code><\/pre>\n
                nextInt(int x)\u306e\u5f15\u6570\u306f\u9664\u5916\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u5f15\u6570\u3068\u3057\u306611\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u751f\u6210\u3055\u308c\u308b\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u306b\u306f0\u3082\u542b\u307e\u308c\u3066\u3044\u308b\u305f\u3081\u30011\u304b\u308910\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\u307e\u3067nextInt\u30e1\u30bd\u30c3\u30c9\u3092\u7e70\u308a\u8fd4\u3057\u547c\u3073\u51fa\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u4efb\u610f\u306e\u7bc4\u56f2\u5185\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u3092\u751f\u6210\u3059\u308b\u3088\u3046\u306b\u62e1\u5f35\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
                3. \u30e9\u30f3\u30c0\u30e0\u306a\u500d\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u751f\u6210\u3059\u308b<\/h3>\n
                \u79c1\u305f\u3061\u306fJava\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u3001Math.random()\u3084Random\u30af\u30e9\u30b9\u306enextDouble\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
                Random random = new Random();\r\n\r\ndouble d = random.nextDouble();\r\n\r\ndouble d1 = Math.random();\r\n<\/code><\/pre>\n
                4. \u30e9\u30f3\u30c0\u30e0\u306a\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u751f\u6210\u3059\u308b<\/h3>\n
                Random random = new Random();\r\n\r\nfloat f = random.nextFloat();\r\n<\/code><\/pre>\n
                5. \u30e9\u30f3\u30c0\u30e0\u306a\u9577\u3055\u3092\u751f\u6210\u3059\u308b<\/h3>\n
                Random random = new Random();\r\n\r\nlong l = random.nextLong();\r\n<\/code><\/pre>\n
                6. \u30e9\u30f3\u30c0\u30e0\u306a\u30d6\u30fc\u30eb\u5024\u3092\u751f\u6210\u3059\u308b\u3002<\/h3>\n
                Random random = new Random();\r\n\r\nboolean flag = random.nextBoolean();\r\n<\/code><\/pre>\n
                7. \u30e9\u30f3\u30c0\u30e0\u306a\u30d0\u30a4\u30c8\u914d\u5217\u3092\u751f\u6210\u3059\u308b<\/h3>\n
                \u30e9\u30f3\u30c0\u30e0\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30e9\u30f3\u30c0\u30e0\u30d0\u30a4\u30c8\u3092\u751f\u6210\u3057\u3001\u305d\u308c\u3092\u30e6\u30fc\u30b6\u30fc\u304c\u6307\u5b9a\u3057\u305f\u30d0\u30a4\u30c8\u914d\u5217\u306b\u914d\u7f6e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u751f\u6210\u3055\u308c\u308b\u30e9\u30f3\u30c0\u30e0\u30d0\u30a4\u30c8\u306e\u6570\u306f\u3001\u30d0\u30a4\u30c8\u914d\u5217\u306e\u9577\u3055\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n
                Random random = new Random();\r\n\r\nbyte[] randomByteArray = new byte[5];\r\n\r\nrandom.nextBytes(randomByteArray);\r\n\r\nSystem.out.println(Arrays.toString(randomByteArray)); \/\/ sample output [-70, -57, 74, 99, -78]\r\n<\/code><\/pre>\n
                8. \u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u306b\u304a\u3051\u308bThreadLocalRandom<\/h3>\n
                \u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306eThreadLocalRandom\u306e\u4f7f\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n
                package com.scdev.randomnumber;\r\n\r\nimport java.util.Random;\r\nimport java.util.concurrent.ThreadLocalRandom;\r\n\r\npublic class ThreadLocalRandomExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tRunnable runnable = new MyRunnable();\r\n\r\n\t\tfor (int i = 0; i < 5; i++) {\r\n\t\t\tThread t = new Thread(runnable);\r\n\t\t\tt.setName(\"MyRunnable-Thread-\" + i);\r\n\t\t\tt.start();\r\n\t\t}\r\n\t}\r\n\r\n}\r\n\r\nclass MyRunnable implements Runnable {\r\n\r\n\t@Override\r\n\tpublic void run() {\r\n\t\tString threadName = Thread.currentThread().getName();\r\n\t\tSystem.out.println(threadName + \"::\" + ThreadLocalRandom.current().nextInt());\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
                \u4ee5\u4e0b\u306f\u3001\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u969b\u306e\u30b5\u30f3\u30d7\u30eb\u51fa\u529b\u3067\u3059\u3002<\/p>\n
                MyRunnable-Thread-0::-1744088963\r\nMyRunnable-Thread-3::139405798\r\nMyRunnable-Thread-1::1403710182\r\nMyRunnable-Thread-2::-1222080205\r\nMyRunnable-Thread-4::-185825276\r\n<\/code><\/pre>\n
                \"ThreadLocalRandom<\/div>\n
                ThreadLocalRandom random = ThreadLocalRandom.current();\r\n\t\t\r\nint rand = random.nextInt(1, 11);\r\n<\/code><\/pre>\n
                ThreadLocalRandom\u306b\u306f\u3001\u30e9\u30f3\u30c0\u30e0\u306along\u578b\u3068double\u578b\u306e\u5024\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u985e\u4f3c\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
                9. SecureRandom\u306e\u4f8b<\/h3>\n
                \u4ee5\u4e0b\u306e\u63d0\u4f9b\u8005\u306e\u3044\u305a\u308c\u304b\u3092\u4f7f\u7528\u3057\u3066\u3001\u3088\u308a\u5b89\u5168\u306a\u4e71\u6570\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306bSecureRandom\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u306f\u7c21\u5358\u306aSecureRandom\u306e\u4f8b\u30b3\u30fc\u30c9\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
                Random random = new SecureRandom();\r\n\r\nint rand = random.nextInt();\r\n\r\nSystem.out.println(rand);\r\n<\/code><\/pre>\n
                \u65e5\u672c\u8a9e\u3067\u8868\u73fe\u3057\u305f\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a
                \nJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u3092\u751f\u6210\u3059\u308b\u306e\u306b\u3064\u3044\u3066\u3001\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n
                \u79c1\u305f\u3061\u306eGitHub\u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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