对数字进行四舍五入的方法

使用Math中的round方法

import java.util.*;

public class qwe {
	public static void main(String[] args) {
		double above = 0.7, below = 0.4;
		float fabove = 0.7f, fbelow = 0.4f;

		System.out.println("Math.round(above)" + Math.round(above));
		System.out.println("Math.round(above)" + Math.round(below));
		System.out.println("Math.round(above)" + Math.round(fabove));
		System.out.println("Math.round(above)" + Math.round(fbelow));

	}

}

结果为:1
       0
       1
       0