Java object simple practical case calculator implementation code

Write a simple case for the use of objects, properties and methods in Java

import java.util.Scanner;
class Calculste
{
 int a; //定义两个整数
 int b;
 String option; //定义接收操作符的字符串
 public void count(){
 
  //对操作符进行判断
  switch(option){
   case "+":
    System.out.println("计算和："+a+"+"+b+"="+(a+b));
   break;
 
   case "-":
    System.out.println("计算差："+a+"-"+b+"="+(a-b));
   break;
 
   case "*":
    System.out.println("计算积："+a+"*"+b+"="+(a*b));
   break;
 
   case "/":
   {
    //作除法运算时，分母不能为 0 
    if (b != 0)
    {
     System.out.println("计算商："+a+"/"+b+"="+(a/b));
    }else{
     System.out.println("您输入的第二个数不能为 0，请重新输入");
    }
   } 
   break;
 
   case "%":
    System.out.println("计算余："+a+"%"+b+"="+(a%b));
   break;
 
   default:
    System.out.println("您输入的操作符有误，请重新输入");
  }
   
 } 
}
class demo3 
{
 //需求： 使用java类描述一个计算器类，计算器具备操作数1， 操作数2 、操作符三个公共 的属性，还具备计算的功能行为。
 public static void main(String[] args) 
 {
  System.out.println("两个数的运算");
  Scanner sca = new Scanner(System.in);
 
  //创建类的对象
  Calculste cal = new Calculste();
 
  //给属性赋值
  System.out.println("第一个数：");
  cal.a = (int)sca.nextInt();
 
  System.out.println("第二个数：");
  cal.b = (int)sca.nextInt();
 
  System.out.println("输入运算符号：");
  cal.option = sca.next(); //接受字符的方法
   
  //调用方法运算
  cal.count();
 }
}

Here are some effects on the console:

Momo said: Java language is an object-oriented programming language. Classes, objects in classes, and object properties and methods are all very important.

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