【Java基础篇】输入两个数实现加减乘除

package com.method;

import java.util.Scanner;

public class method02 {
  public static void main(String[] args) {
    int num1 = 0;
    int num2 = 0;
    int result = 0;
    int type = 0;
    Scanner scanner = new Scanner(System.in);
    if (scanner.hasNextInt()) {
      type = scanner.nextInt();
      num1 = scanner.nextInt();
      num2 = scanner.nextInt();
    }
    switch (type) {
      case 0:
        result = method02.add(num1, num2);
        break;
      case 1:
        result = method02.sub(num1, num2);
        break;
      case 2:
        result = method02.cen(num1, num2);
        break;
      case 3:
        result = method02.cu(num1, num2);
        break;
      default:
        System.out.println("方法不存在");
        break;
    }
    System.out.println(result);
    scanner.close();
  }

  public static int add(int num1, int num2) {
    return num1 + num2;
  }
  public static int sub(int num1, int num2) {
    return num1 - num2;
  }
  public static int cen(int num1, int num2) {
    return num1 * num2;
  }
  public static int cu(int num1, int num2) {
    return num1 / num2;
  }
}