高效BigDecimal向上和向下舍入到小数点后两位 [英] Efficient BigDecimal round Up and down to two decimals

问题描述

在java中我试图找到一种有效的方法将BigDecimal舍入到两位小数，根据条件向上或向下。

In java am trying to find an efficient way to round a BigDecimal to two decimals, Up or Down based on a condition.

 IF condition true then:
    12.390 ---> 12.39
    12.391 ---> 12.40
    12.395 ---> 12.40
    12.399 ---> 12.40

 If condition false then:
    12.390 ---> 12.39
    12.391 ---> 12.39
    12.395 ---> 12.39
    12.399 ---> 12.39

实现这一目标的最有效方法是什么？

What is the most efficient way to accomplish this?

推荐答案

public static BigDecimal round(BigDecimal d, int scale, boolean roundUp) {
  int mode = (roundUp) ? BigDecimal.ROUND_UP : BigDecimal.ROUND_DOWN;
  return d.setScale(scale, mode);
}
round(new BigDecimal("12.390"), 2, true); // => 12.39
round(new BigDecimal("12.391"), 2, true); // => 12.40
round(new BigDecimal("12.391"), 2, false); // => 12.39
round(new BigDecimal("12.399"), 2, false); // => 12.39

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