简易计算器

package com.lime.method;

import java.util.Scanner;

public class Demo06 {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        System.out.println("输入：");
        if (scanner.hasNextInt()){
            int i=scanner.nextInt();
            String a = scanner.next();
            int j=scanner.nextInt();
            switch (a){
                case"+":
                    int add=add(i,j);
                    System.out.println(add);
                    break;
                case"-":
                    int jian=jian(i,j);
                    System.out.println(jian);
                    break;
                case"*":
                    int cheng=cheng(i,j);
                    System.out.println(cheng);
                    break;
                case"/":
                    int chu=chu(i,j);
                    System.out.println(chu);
                    break;
            }
            scanner.close();
        }
    }
    public static int add(int a,int b){
        return a+b;
    }
    public static int jian(int a,int b){
        return a-b;

    }
    public static int cheng(int a,int b){
        return a*b;
    }
    public static int chu(int a,int b){
        if(b==0){
            System.out.println("错误");
        }
            return a/b;
    }
}