{"id":28247,"date":"2024-03-16T09:59:37","date_gmt":"2024-03-16T09:59:37","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-numberformat-used-in-java\/"},"modified":"2024-03-22T12:59:32","modified_gmt":"2024-03-22T12:59:32","slug":"how-is-the-numberformat-used-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-numberformat-used-in-java\/","title":{"rendered":"How is the NumberFormat used in Java?"},"content":{"rendered":"

The NumberFormat class in Java is used for formatting numbers, providing static and instance methods for formatting and parsing numbers.<\/p>\n

    \n
  1. Retrieve NumberFormat instance using static methods.<\/li>\n
  2. getInstance(): Returns a general number formatter for the current default language environment.<\/li>\n
  3. getCurrencyInstance() returns a general currency formatter for the current default locale.<\/li>\n
  4. getPercentInstance(): returns a general percentage formatter for the current default language environment.<\/li>\n
  5. Example methods:<\/li>\n
  6. setMaxIntegerDigits(int newValue): Set the maximum number of integer digits.<\/li>\n
  7. setMinimumIntegerDigits(int newValue): Specify the minimum number of integer digits.<\/li>\n
  8. Set maximum number of decimal places.<\/li>\n
  9. setMinimumFractionDigits(int newValue): sets the minimum number of decimal places.<\/li>\n
  10. setGroupingUsed(boolean newValue): enable\/disable grouping (thousands separator).<\/li>\n
  11. format(double\/long\/Number number): Convert a number into a formatted string.<\/li>\n
  12. parse(String source): parse the string into a number.<\/li>\n<\/ol>\n

    Example code:<\/p>\n

    import<\/span> java.text.NumberFormat;\r\n\r\npublic<\/span> class<\/span> NumberFormatExample<\/span> {\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> {\r\n        double<\/span> number<\/span> =<\/span> 12345.6789<\/span>;\r\n\r\n        \/\/ \u83b7\u53d6\u901a\u7528\u6570\u503c\u683c\u5f0f\u5668<\/span>\r\n        NumberFormat<\/span> numberFormat<\/span> =<\/span> NumberFormat.getInstance();\r\n        String<\/span> formattedNumber<\/span> =<\/span> numberFormat.format(number);\r\n        System.out.println(\"\u901a\u7528\u683c\u5f0f\u5316\uff1a\"<\/span> + formattedNumber);\r\n\r\n        \/\/ \u83b7\u53d6\u8d27\u5e01\u683c\u5f0f\u5668<\/span>\r\n        NumberFormat<\/span> currencyFormat<\/span> =<\/span> NumberFormat.getCurrencyInstance();\r\n        String<\/span> formattedCurrency<\/span> =<\/span> currencyFormat.format(number);\r\n        System.out.println(\"\u8d27\u5e01\u683c\u5f0f\u5316\uff1a\"<\/span> + formattedCurrency);\r\n\r\n        \/\/ \u83b7\u53d6\u767e\u5206\u6bd4\u683c\u5f0f\u5668<\/span>\r\n        NumberFormat<\/span> percentFormat<\/span> =<\/span> NumberFormat.getPercentInstance();\r\n        String<\/span> formattedPercent<\/span> =<\/span> percentFormat.format(number);\r\n        System.out.println(\"\u767e\u5206\u6bd4\u683c\u5f0f\u5316\uff1a\"<\/span> + formattedPercent);\r\n\r\n        \/\/ \u89e3\u6790\u5b57\u7b26\u4e32\u4e3a\u6570\u5b57<\/span>\r\n        String<\/span> source<\/span> =<\/span> \"12,345.6789\"<\/span>;\r\n        try<\/span> {\r\n            double<\/span> parsedNumber<\/span> =<\/span> numberFormat.parse(source).doubleValue();\r\n            System.out.println(\"\u89e3\u6790\u7ed3\u679c\uff1a\"<\/span> + parsedNumber);\r\n        } catch<\/span> (Exception e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n
    Output result:<\/p>\n
    \u901a\u7528\u683c\u5f0f\u5316\uff1a12,345.679\r\n\u8d27\u5e01\u683c\u5f0f\u5316\uff1a\uffe512,345.68\r\n\u767e\u5206\u6bd4\u683c\u5f0f\u5316\uff1a1,234,568%\r\n\u89e3\u6790\u7ed3\u679c\uff1a12345.679\r\n<\/code><\/pre>\n
    The NumberFormat class makes it easy to format and parse numbers in order to meet various display requirements.<\/p>\n","protected":false},"excerpt":{"rendered":"
    The NumberFormat class in Java is used for formatting numbers, providing static and instance methods for formatting and parsing numbers. Retrieve NumberFormat instance using static methods. getInstance(): Returns a general number formatter for the current default language environment. getCurrencyInstance() returns a general currency formatter for the current default locale. getPercentInstance(): returns a general percentage formatter […]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-28247","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow is the NumberFormat used in Java? - Blog - Silicon Cloud<\/title>\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\/blog\/how-is-the-numberformat-used-in-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How is the NumberFormat used in Java?\" \/>\n<meta property=\"og:description\" content=\"The NumberFormat class in Java is used for formatting numbers, providing static and instance methods for formatting and parsing numbers. 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