什么是HALF_EVEN四舍五入？ [英] What is HALF_EVEN rounding for?

问题描述

我无法想象我需要在Java中使用 RoundingMode.HALF_EVEN 的情况。

I can not imagine a situation that I need to use RoundingMode.HALF_EVEN in Java.

什么是这个舍入模式为？
我想什么时候使用它？

What is this rounding mode for? When do I want to use it?

请给我一些真实世界的例子。

Please give me some real world examples.

推荐答案

当您执行多个舍入操作并希望累积结果为真正的平均值，而不是像HALF_UP或HALF_DOWN一样向上或向下倾斜时，它非常有用。

It is useful when you are performing multiple rounding operations and want the cumulative result to be a true average, and not skewed up or down, as it would be with HALF_UP or HALF_DOWN.

具体来说，它对统计分析很有用（您不希望非随机平均系统污染结果）或任何需要随机平均的情况。

Specifically, it is useful for statistical analysis (you don't want the results polluted by a non-random averaging system) or any situation where you want random averaging.

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