Java四舍五入至最接近的.5

@SamiKorhonen在评论中说：

乘以二，取整，最后除以二

所以这是代码：

public static double roundToHalf(double d) {    return Math.round(d * 2) / 2.0;}public static void main(String[] args) {    double d1 = roundToHalf(1.1);    double d2 = roundToHalf(1.3);    double d3 = roundToHalf(2.5);    double d4 = roundToHalf(3.223920);    double d5 = roundToHalf(3);    System.out.println(d1);    System.out.println(d2);    System.out.println(d3);    System.out.println(d4);    System.out.println(d5);}

输出：

1.01.52.53.03.0