{"id":264,"date":"2022-12-10T04:56:32","date_gmt":"2023-10-31T21:06:29","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e9%9a%8f%e6%9c%ba%e6%95%b0%e7%94%9f%e6%88%90%e5%99%a8\/"},"modified":"2025-08-01T03:06:02","modified_gmt":"2025-07-31T19:06:02","slug":"java%e9%9a%8f%e6%9c%ba%e6%95%b0%e7%94%9f%e6%88%90%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e9%9a%8f%e6%9c%ba%e6%95%b0%e7%94%9f%e6%88%90%e5%99%a8\/","title":{"rendered":"Java\u968f\u673a\u6570\u751f\u6210\u5668\uff1a\u5b89\u5168\u3001\u9ad8\u6548\u4e0e\u5e94\u7528\u5b9e\u8df5"},"content":{"rendered":"<p>Java\u7684Random\u7c7b\u7528\u4e8e\u751f\u6210\u4e00\u7cfb\u5217\u968f\u673a\u6570\u5b57\u3002<\/p>\n<h2>Java\u7684Random\u7c7b<\/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>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c5fc\/3-0.png\" class='post-images' alt=\"Java Random Class, Random Class in Java\" title=\"\">\n                        <\/div>\n<h3>Java\u968f\u673a\u6784\u9020\u51fd\u6570<\/h3>\n<p>Java\u7684Random\u7c7b\u6709\u4e24\u4e2a\u6784\u9020\u65b9\u6cd5\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<ol>Random() \uff1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u968f\u673a\u751f\u6210\u5668\u3002<br \/>\nRandom(long seed) \uff1a\u4f7f\u7528\u6307\u5b9a\u7684\u79cd\u5b50\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u968f\u673a\u751f\u6210\u5668\u3002<\/ol>\n<h3>Java Random\u7c7b\u7684\u65b9\u6cd5<\/h3>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u770bJava Random\u7c7b\u7684\u4e00\u4e9b\u65b9\u6cd5\u3002<\/p>\n<ol>nextBoolean(): \u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u968f\u673a\u6570\u751f\u6210\u5668\u5e8f\u5217\u4e2d\u7684\u4e0b\u4e00\u4e2a\u4f2a\u968f\u673a\u5e03\u5c14\u503c\u3002<br \/>\nnextDouble(): \u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de0.0\u548c1.0\u4e4b\u95f4\u7684\u4e0b\u4e00\u4e2a\u4f2a\u968f\u673a\u53cc\u7cbe\u5ea6\u503c\u3002<br \/>\nnextFloat(): \u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de0.0\u548c1.0\u4e4b\u95f4\u7684\u4e0b\u4e00\u4e2a\u4f2a\u968f\u673a\u5355\u7cbe\u5ea6\u503c\u3002<br \/>\nnextInt(): \u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u968f\u673a\u6570\u751f\u6210\u5668\u5e8f\u5217\u4e2d\u7684\u4e0b\u4e00\u4e2a\u6574\u6570\u503c\u3002<br \/>\nnextInt(int n): \u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u968f\u673a\u6570\u751f\u6210\u5668\u5e8f\u5217\u4e2d\u4ece0\u5230\u6307\u5b9a\u503c\u4e4b\u95f4\u7684\u4e0b\u4e00\u4e2a\u4f2a\u968f\u673a\u6574\u6570\u503c\u3002<\/ol>\n<h3>Java\u968f\u673a\u793a\u4f8b<\/h3>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u4e0b\u9762\u7684Java\u968f\u673a\u6570\u793a\u4f8b\u7a0b\u5e8f\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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>\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\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>\u8bf7\u67e5\u770b\u6b64\u5e16\u5b50\u83b7\u53d6\u6709\u5173Java\u968f\u673a\u6570\u751f\u6210\u7684\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n<h3>\u4f7f\u7528\u79cd\u5b50\u751f\u6210\u968f\u673a\u6570<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u7528\u4e24\u79cd\u65b9\u6cd5\u4f7f\u7528\u79cd\u5b50\u751f\u6210\u968f\u673a\u6570\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>\u79cd\u5b50\u662f\u7531next(int)\u65b9\u6cd5\u7ef4\u62a4\u7684\u4f2a\u968f\u673a\u6570\u751f\u6210\u5668\u7684\u5185\u90e8\u72b6\u6001\u7684\u521d\u59cb\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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\u8ff0\u7a0b\u5e8f\u7684\u8f93\u51fa\u4e3a\uff1a<\/p>\n<pre class=\"post-pre\"><code>Using Constructor\r\n-1193959466\r\nUsing Method\r\n-1133938638\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u7ed9\u4e24\u4e2a\u4e0d\u540c\u7684\u968f\u673a\u6570\u751f\u6210\u5668\u4f20\u9012\u76f8\u540c\u7684\u79cd\u5b50\uff0c\u4f1a\u53d1\u751f\u4ec0\u4e48\u5462\uff1f\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u4e0b\u9762\u7684\u7a0b\u5e8f\uff0c\u770b\u770b\u5982\u679c\u6211\u4eec\u7ed9\u4e24\u4e2a\u4e0d\u540c\u7684\u968f\u673a\u6570\u751f\u6210\u5668\u4f20\u9012\u76f8\u540c\u7684\u79cd\u5b50\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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>\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u4e3a\uff1a<\/p>\n<pre class=\"post-pre\"><code>-1193959466\r\n-1193959466\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u5982\u679c\u6211\u4eec\u5c06\u76f8\u540c\u7684\u79cd\u5b50\u4f20\u9012\u7ed9\u4e24\u4e2a\u4e0d\u540c\u7684\u968f\u673a\u6570\u751f\u6210\u5668\uff0c\u5b83\u4eec\u5c06\u751f\u6210\u76f8\u540c\u7684\u968f\u673a\u6570\u3002<\/p>\n<h3>Java 8 \u968f\u673a\u7c7b\u65b9\u6cd5<\/h3>\n<p>\u4ece\u4e0a\u9762\u7684\u56fe\u7247\u53ef\u4ee5\u770b\u51fa\uff0c\u5728Java 8\u4e2dRandom\u7c7b\u4e2d\u6dfb\u52a0\u4e86\u8bb8\u591a\u65b0\u65b9\u6cd5\u3002\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u4ea7\u751f\u4e00\u4e32\u968f\u673a\u6570\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f\uff0c\u7528\u4e8e\u751f\u62101\u5230100\u4e4b\u95f4\u76845\u4e2a\u6574\u6570\u6d41\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c5fc\/31-0.png\" class='post-images' alt=\"java random number, java random int stream\" title=\"\">\n                        <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Java\u7684Random\u7c7b\u7528\u4e8e\u751f\u6210\u4e00\u7cfb\u5217\u968f\u673a\u6570\u5b57\u3002 Java\u7684Random\u7c7b Random class is p [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[189,964,962,963,816],"class_list":["post-264","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java","tag-random","tag-962","tag-963","tag-816"],"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>Java\u968f\u673a\u6570\u751f\u6210\u5668\uff1a\u5b89\u5168\u3001\u9ad8\u6548\u4e0e\u5e94\u7528\u5b9e\u8df5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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content=\"\u79d1, \u9896\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u79d1, \u9896\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/java%e9%9a%8f%e6%9c%ba%e6%95%b0%e7%94%9f%e6%88%90%e5%99%a8\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/java%e9%9a%8f%e6%9c%ba%e6%95%b0%e7%94%9f%e6%88%90%e5%99%a8\/\",\"name\":\"Java\u968f\u673a\u6570\u751f\u6210\u5668\uff1a\u5b89\u5168\u3001\u9ad8\u6548\u4e0e\u5e94\u7528\u5b9e\u8df5 - Blog - Silicon 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