四舍五入

四舍五入 package wu; import java.util.Scanner; public class FiveFour { /** * @param args */ public static void main(String[] args) { FiveFour ff = new FiveFour(); Scanner sc = new Scanner(System.in); float in = sc.nextFloat(); System.out.print("请输入一个浮点型数:"); ff.method(in); } public void method(float a){ float b = (a * 100) % 10; if(b < 5){ b = (a * 100)- (b % 10) + 5; }else{ b = (a * 100)- (b % 10) + 10; } System.out.format("%.2f",b/100); } }