{"id":12424,"date":"2024-03-14T15:49:52","date_gmt":"2024-03-14T15:49:52","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-extract-numbers-from-a-string-in-java\/"},"modified":"2025-08-05T01:22:48","modified_gmt":"2025-08-05T01:22:48","slug":"how-to-extract-numbers-from-a-string-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-extract-numbers-from-a-string-in-java\/","title":{"rendered":"Extract Numbers from String in Java: 2 Methods"},"content":{"rendered":"

In Java, you can use regular expressions or loop through strings to extract numbers.<\/p>\n

    \n
  1. Design or arrangement<\/li>\n
  2. One who matches<\/li>\n<\/ol>\n
    import<\/span> java.util.regex.Matcher;\r\nimport<\/span> java.util.regex.Pattern;\r\n\r\npublic<\/span> class<\/span> Main<\/span> {\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> {\r\n        String<\/span> str<\/span> =<\/span> \"abc123def456\"<\/span>;\r\n        Pattern<\/span> pattern<\/span> =<\/span> Pattern.compile(\"\\\\d+\"<\/span>);\r\n        Matcher<\/span> matcher<\/span> =<\/span> pattern.matcher(str);\r\n        \r\n        while<\/span> (matcher.find()) {\r\n            String<\/span> number<\/span> =<\/span> matcher.group();\r\n            System.out.println(number);\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n
      \n
    1. Check if the character is a digit.<\/li>\n<\/ol>\n
      public<\/span> class<\/span> Main<\/span> {\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> {\r\n        String<\/span> str<\/span> =<\/span> \"abc123def456\"<\/span>;\r\n        StringBuilder<\/span> sb<\/span> =<\/span> new<\/span> StringBuilder<\/span>();\r\n        \r\n        for<\/span> (char<\/span> c : str.toCharArray()) {\r\n            if<\/span> (Character.isDigit(c)) {\r\n                sb.append(c);\r\n            }\r\n        }\r\n        \r\n        String<\/span> numbers<\/span> =<\/span> sb.toString();\r\n        System.out.println(numbers);\r\n    }\r\n}\r\n<\/code><\/pre>\n
      The choice between these two methods for extracting numbers from a string depends on the specific requirements and format of the string.<\/p>\n","protected":false},"excerpt":{"rendered":"
      In Java, you can use regular expressions or loop through strings to extract numbers. Design or arrangement One who matches import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static void main(String[] args) { String str = “abc123def456”; Pattern pattern = Pattern.compile(“\\\\d+”); Matcher matcher = pattern.matcher(str); while (matcher.find()) { String number = matcher.group(); System.out.println(number); } […]<\/p>\n","protected":false},"author":13,"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":[1574,16285,179,16283,16284],"class_list":["post-12424","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java-programming-basics","tag-java-regex-tutorial","tag-java-string-manipulation","tag-java-string-parsing","tag-number-extraction-java"],"yoast_head":"\nExtract Numbers from String in Java: 2 Methods - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to extract numbers from string in Java using regex and loops. 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