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代码如下：
//AddOperation类：
/*
?* 加法运算
?*/
public class AddOperation extends Operation {
?? ?
?? ?public AddOperation(int num1,int num2) {
?? ??? ?super(num1,num2);
?? ?}
?? ?//重写运算方式
?? ?@Override
?? ?public void operate() {
?? ??? ?System.out.println(num1+"+"+num2+"="+(num1+num2));
?? ?}
}
//SubOperation类：
/*
?*减法运算
?*/
public class SubOperation extends Operation {
?? ?public SubOperation(int num1,num2);
?? ?}
?? ?//重写运算方式
?? ?@Override
?? ?public void operate() {
?? ??? ?System.out.println(num1+"-"+num2+"="+(num1-num2));
?? ?}
}
//MultiOperation类：
/*
?* 乘法运算
?*/
public class MultiOperation extends Operation {
?? ?
?? ?public MultiOperation(int num1,num2);
?? ?}
?? ?//重写运算方式
?? ?@Override
?? ?public void operate() {
?? ??? ?System.out.println(num1+"*"+num2+"="+(num1*num2));
?? ?}
}
//DivOperation类：
/*
?* 除法运算
?*/
public class DivOperation extends Operation {?? ?
?? ?public DivOperation(int num1,num2);
?? ?}
?? ?//重写运算方式
?? ?@Override
?? ?public void operate() {
?? ??? ?if(num2==0){
?? ??? ??? ?System.out.println("抛出异常，除数不能为0");
?? ??? ??? ?return;
?? ??? ?}
?? ??? ?System.out.println(num1+"/"+num2+"="+(num1/num2));
?? ?}
}
//测试Demo类：
import java.util.Scanner;
/*
?* 使用面向对象实现：两个数的四则运算
?*/
public class Demo {
?? ?public static void main(String[] args) {
?? ??? ?Scanner sc=new Scanner(System.in);
?? ??? ?System.out.println("请输入第一个整数：");
?? ??? ?int m=sc.nextInt();
?? ??? ?System.out.println("请输入第二个整数：");
?? ??? ?int n=sc.nextInt();
?? ??? ?System.out.println("请选择进行的运算：t1加法t2减法t3乘法t4除法");
?? ??? ?int opNum=sc.nextInt();
?? ??? ?switch (opNum) {
?? ??? ?case 1:
?? ??? ??? ?AddOperation addOperation=new AddOperation(m,n);
?? ??? ??? ?addOperation.operate();
?? ??? ??? ?break;
?? ??? ?case 2:
?? ??? ??? ?SubOperation subOperation=new SubOperation(m,n);
?? ??? ??? ?subOperation.operate();
?? ??? ??? ?break;
?? ??? ?case 3:
?? ??? ?
?? ??? ??? ?MultiOperation multiOperation=new MultiOperation(m,n);
?? ??? ??? ?multiOperation.operate();
?? ??? ??? ?break;
?? ??? ?case 4:
?? ??? ??? ?DivOperation divOperation=new DivOperation(m,n);
?? ??? ??? ?divOperation.operate();
?? ??? ??? ?break;
?? ??? ?default:
?? ??? ??? ?System.out.println("操作不正确");
?? ??? ??? ?break;
?? ??? ?}
?? ?}
?? ?//进行两个数的四则运算
?? ?public static void Operate(Operation operations){
?? ??? ?operations.operate();
?? ?}
}
（编辑：北几岛）
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