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        格式,Java 中双精度和整数的 2 位小数和 0

        时间:2023-06-28
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                  本文介绍了格式,Java 中双精度和整数的 2 位小数和 0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

                  如果它有分数,我正在尝试将双精度格式化为精确的 2 位小数,否则使用 DecimalFormat 将其截断

                  I am trying to format a double to exact 2 decimal places if it has fraction, and cut it off otherwise using DecimalFormat

                  所以,我想实现下一个结果:

                  So, I'd like to achieve next results:

                  100.123 -> 100.12
                  100.12  -> 100.12
                  100.1   -> 100.10
                  100     -> 100
                  

                  变体 #1

                  DecimalFormat("#,##0.00")
                  
                  100.1 -> 100.10
                  but
                  100   -> 100.00
                  

                  变体 #2

                  DecimalFormat("#,##0.##")
                  
                  100   -> 100
                  but
                  100.1 -> 100.1
                  

                  有什么想法在我的情况下选择什么模式?

                  Have any ideas what pattern to choose in my case?

                  推荐答案

                  我达到的唯一解决方案是使用这里提到的 if 语句:https://stackoverflow.com/a/39268176/6619441

                  The only solution i reached is to use if statement like was mentioned here: https://stackoverflow.com/a/39268176/6619441

                  public static boolean isInteger(BigDecimal bigDecimal) {
                      int intVal = bigDecimal.intValue();
                      return bigDecimal.compareTo(new BigDecimal(intVal)) == 0;
                  }
                  
                  public static String myFormat(BigDecimal bigDecimal) {
                      String formatPattern = isInteger(bigDecimal) ? "#,##0" : "#,##0.00";
                      return new DecimalFormat(formatPattern).format(bigDecimal);
                  }
                  

                  测试

                  myFormat(new BigDecimal("100"));   // 100
                  myFormat(new BigDecimal("100.1")); // 100.10
                  

                  如果有人知道更优雅的方式,请分享!

                  If someone knows more elegant way, please share it!

                  这篇关于格式,Java 中双精度和整数的 2 位小数和 0的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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