使用Java中类，接口，继承等方法编写简单的计算器

使用Java中类，接口，继承等方法编写简单的计算器

• 写个计算器，能完成加减乘除运算
  • 定义接⼝做参数
  • 加减乘除定义4个类
  • 定义⼀个静态⼯具类，把下⾯的接⼝作为其中⼀个形参对象，传递具体的运算符类完成计算
  • interface ICompute{ int computer(int num1, int num2); }
    
    

package test.Ex6_9;

/**
 * 这个是一个计算器的接口
 */
public interface Icompute {
    
    
    /**
     * 通过传递两个参数值，来完成运算
     * @param num1 参数1
     * @param num2 参数2
     * @return 返回对应结果
     */
    int compute(int num1, int num2 );
}

package test.Ex6_9;

public class Addition implements Icompute {
    
    
    @Override
    public int compute(int num1, int num2) {
    
    
        return num1 + num2;
    }
}

package test.Ex6_9;

public class Division implements Icompute{
    
    
    @Override
    public int compute(int num1, int num2) {
    
    
        try {
    
    
            return num1 / num2;
        }catch (Exception e){
    
    
            e.printStackTrace();
        }
        return -1;
    }
}

package test.Ex6_9;

public class Multiplication implements Icompute{
    
    
    @Override
    public int compute(int num1, int num2) {
    
    

        return num1 * num2;
    }
}

package test.Ex6_9;

public class Subtraction implements Icompute{
    
    
    @Override
    public int compute(int num1, int num2) {
    
    
        return num1 - num2;
    }
}

在这里插入代码片package test.Ex6_9;

import java.util.Scanner;

public class UserCompute {
    
    
    public static void compute(Icompute icompute ,int num1 , int num2){
    
    
        int result =  icompute.compute(num1,num2);
        System.out.println(result);
    }

    public static void main(String[] args) {
    
    
        System.out.println("请输入两个数字（回车键确定）");
        Scanner scanner1 =new Scanner(System.in);
        int i = scanner1.nextInt();
        Scanner scanner2 =new Scanner(System.in);
        int j = scanner2.nextInt();
        System.out.println("和");
        compute(new Addition(),i,j);
        System.out.println("差");
        compute(new Subtraction(),i,j);
        System.out.println("积");
        compute(new Multiplication(),i,j);
        System.out.println("商");
        compute(new Division(),i,j);
    }
}