import java.math.BigDecimal; target.setWeight(source.getWeight().setScale(3, BigDecimal.ROUND_HALF_UP));
不同舍入模式下的舍入操作汇总
| 根据给定的舍入模式将输入数字舍入为一位数的结果 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 输入数字 | UP | DOWN | CEILING | FLOOR | HALF_UP | HALF_DOWN | HALF_EVEN | UNNECESSARY |
| 5.5 | 6 | 5 | 6 | 5 | 6 | 5 | 6 | 抛出 ArithmeticException |
| 2.5 | 3 | 2 | 3 | 2 | 3 | 2 | 2 | 抛出 ArithmeticException |
| 1.6 | 2 | 1 | 2 | 1 | 2 | 2 | 2 | 抛出 ArithmeticException |
| 1.1 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 抛出 ArithmeticException |
| 1.0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| -1.0 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 |
| -1.1 | -2 | -1 | -1 | -2 | -1 | -1 | -1 | 抛出 ArithmeticException |
| -1.6 | -2 | -1 | -1 | -2 | -2 | -2 | -2 | 抛出 ArithmeticException |
| -2.5 | -3 | -2 | -2 | -3 | -3 | -2 | -2 | 抛出 ArithmeticException |
| -5.5 | -6 | -5 | -5 | -6 | -6 | -5 | -6 | 抛出 ArithmeticException |