加减乘除
import java.util.Scanner; public class Eext { public static void main(String[] args) { Cale cale = new Cale(3 , 3); System.out.println("加结果为:" + cale.add()); System.out.println("减结果为:" + cale.reduce()); System.out.println("乘结果为:" + cale.ride()); Double resdiv = cale.div(); if (resdiv != null) { System.out.println("除结果为:" + resdiv); } } } //创建一个Cale计算机类,在其中定义两个变量表示两个操作数, //定义四个方法实现求和求差、乘、除并创建两个对象分别测试 //除数为零的话提示 class Cale { double num1; double num2; public Cale(double num1 , double num2) { this.num1 = num1; this.num2 = num2; } //加 public double add() { return num1 + num2; } //减 public double reduce() { return num1 - num2; } //乘 public double ride() { return num1 * num2; } //除 public Double div() { if (num2 == 0) { System.out.println("除数不能为零"); return null; } return num1 / num2; } }