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        如何将字符串数字格式化为逗号和四舍五入?

        How can I format a String number to have commas and round?(如何将字符串数字格式化为逗号和四舍五入?)

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                  本文介绍了如何将字符串数字格式化为逗号和四舍五入?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  将以下数字格式化为字符串的最佳方法是什么?

                  What is the best way to format the following number that is given to me as a String?

                  String number = "1000500000.574" //assume my value will always be a String
                  

                  我希望这是一个字符串,其值为:1,000,500,000.57

                  I want this to be a String with the value: 1,000,500,000.57

                  我怎样才能这样格式化它?

                  How can I format it as such?

                  推荐答案

                  你可能想看看 DecimalFormat 类;它支持不同的语言环境(例如:在某些国家/地区会被格式化为 1.000.500.000,57).

                  您还需要将该字符串转换为数字,这可以通过以下方式完成:

                  You also need to convert that string into a number, this can be done with:

                  double amount = Double.parseDouble(number);
                  

                  代码示例:

                  String number = "1000500000.574";
                  double amount = Double.parseDouble(number);
                  DecimalFormat formatter = new DecimalFormat("#,###.00");
                  
                  System.out.println(formatter.format(amount));
                  

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