Java双重比较 [英] Java Double Comparison

问题描述

有没有任何java库进行双重比较？
eg

  public static boolean greaterThanOrEqual（double a，double b，double epsilon）{
 return a -  b> -epsilon; 
} 
  

每个项目我开始我最终重新实现这个和复制粘贴代码并且测试。

注意一个很好的例子，为什么更好地使用第三方JAR是IBM推荐以下内容：

如果您不了解基础测量的规模，则使用
测试abs（a / b - 1）< epsilon可能比简单的
比较差异更强大

我怀疑很多人会想到这个并且说明即使是简单的代码可能是次优的。

解决方案

Guava 有 DoubleMath.fuzzyCompare（） 。

Are there any java libraries for doing double comparison? e.g.

public static boolean greaterThanOrEqual(double a, double b, double epsilon){
     return a - b > -epsilon;
}

Every project I start I end up re-implementing this and copy-pasting code and test.

NB a good example of why its better to use 3rd party JARs is that IBM recommend the following:

"If you don't know the scale of the underlying measurements, using the test "abs(a/b - 1) < epsilon" is likely to be more robust than simply comparing the difference"

I doubt many people would have thought of this and illustrates that even simple code can be sub-optimal.

解决方案

Guava has DoubleMath.fuzzyCompare().

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