1四舍五入
import java.math.BigDecimal;class MyMath {public static double round(double num, int scale) {BigDecimal big = new BigDecimal(num);BigDecimal result = big.divide(newBigDecimal(1), scale,BigDecimal.ROUND_HALF_UP);return result.doubleValue() ;}}public class TestDemo {public static void main(String[] args) {System.out.println(MyMath.round(5.433677, 2));}}
别想一下造出大海,必须先由小河川开始。