java - BigDecimal 舍入问题

Question

我希望能够将任何数字四舍五入到整数的四分之一。

例如:

100.33 -> 100.50100.12 -> 100.25100.66 -> 100.75100.99 -> 101.00100.70 -> 100.75100.00 -> 100.00100.25 -> 100.25

伦理...

谢谢大家...

Answer 1

这可以满足您的需要:乘以 4，向上取整，然后除以 4。

    String[] tests = {
        "100.33", "100.12", "100.66", "100.99", "100.70", "100.00", "100.25",
    };
    final BigDecimal FOUR = BigDecimal.valueOf(4);
    for (String test : tests) {
        BigDecimal d = new BigDecimal(test);
        d = d.multiply(FOUR).setScale(0, RoundingMode.UP)
             .divide(FOUR, 2, RoundingMode.UNNECESSARY);
        System.out.println(d);
    }