{"id":11384,"date":"2024-03-14T14:01:29","date_gmt":"2024-03-14T14:01:29","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-generate-random-non-repeating-numbers-in-java\/"},"modified":"2025-08-04T11:13:12","modified_gmt":"2025-08-04T11:13:12","slug":"how-to-generate-random-non-repeating-numbers-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-generate-random-non-repeating-numbers-in-java\/","title":{"rendered":"Java Non-Repeating Random Numbers Generator"},"content":{"rendered":"

In Java, you can use a Set to store randomly generated numbers and ensure that they are not repeated. The specific steps are as follows:<\/p>\n

    \n
  1. Create a Set collection to store the generated random numbers.<\/li>\n
  2. Generate random numbers using the Random class.<\/li>\n
  3. Check if the generated random number already exists in the Set collection, if it does, generate a new one until a unique random number is produced.<\/li>\n
  4. Add unique random numbers to a Set collection.<\/li>\n<\/ol>\n

    Here is an example code:<\/p>\n

    import<\/span> java.util.HashSet;\r\nimport<\/span> java.util.Random;\r\nimport<\/span> java.util.Set;\r\n\r\npublic<\/span> class<\/span> UniqueRandomNumberGenerator<\/span> {\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> {\r\n        Set<Integer> set = new<\/span> HashSet<\/span><>();\r\n        Random<\/span> random<\/span> =<\/span> new<\/span> Random<\/span>();\r\n\r\n        while<\/span>(set.size() < 10<\/span>) {\r\n            int<\/span> randomNumber<\/span> =<\/span> random.nextInt(100<\/span>); \/\/ \u751f\u62100\u523099\u4e4b\u95f4\u7684\u968f\u673a\u6570<\/span>\r\n            if<\/span>(!set.contains(randomNumber)) {\r\n                set.add(randomNumber);\r\n            }\r\n        }\r\n\r\n        System.out.println(\"\u968f\u673a\u751f\u6210\u7684\u4e0d\u91cd\u590d\u6570\u5b57\uff1a\"<\/span>);\r\n        for<\/span>(Integer num : set) {\r\n            System.out.println(num);\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n
    In the example above, we generated and printed 10 unique random numbers. The range and quantity of random numbers generated can be adjusted as needed.<\/p>\n","protected":false},"excerpt":{"rendered":"
    In Java, you can use a Set to store randomly generated numbers and ensure that they are not repeated. The specific steps are as follows: Create a Set collection to store the generated random numbers. Generate random numbers using the Random class. Check if the generated random number already exists in the Set collection, if […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[183,180,14682,7134,14681],"class_list":["post-11384","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java-code-examples","tag-java-programming","tag-non-repeating-numbers","tag-random-numbers","tag-set-collection"],"yoast_head":"\nJava Non-Repeating Random Numbers Generator - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to generate non-repeating random numbers in Java using Set collections. 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