JAVA控制台计算器

package com.langtao.array;
import java.util.Scanner;

  public class Demo1 {

      public static void main(String[] args) {

          Scanner scanner = new Scanner(System.in);
          String response = "";
          do{
              System.out.println("Are you ready?");
              response = scanner.nextLine();
              if(response.equals("N")){
                  break;
              }
              System.out.println(response);

              System.out.println("Please enter 1 + 3: ");
              String[] s = scanner.nextLine().split(" ");
              double result = 0;
              Demo1 calculator = new Demo1();
              for (int i = 0; i < s.length; i++) {
                  System.out.println(s[i]);
              }
              int m = Integer.parseInt(s[0]);
              int n = Integer.parseInt(s[2]);

              switch (s[1]) {
                  case "+":
                      result = calculator.add(m, n);
                      break;

                  case "-":
                      result = calculator.sub(m, n);
                      break;

                  case "*":
                      result = calculator.mul(m, n);
                      break;

                  case "/":
                      result = calculator.div(m, n);
                      break;
              }

              System.out.println(result);

          }while(true);


         scanner.close();

      }


      public int add(int a, int b){
          return a + b;
      }

      public int sub(int a, int b){
          return a - b;
      }

      public int mul(int a, int b){
          return a * b;
      }

      public double div(int a, int b){
          if( b == 0){
              System.out.println("You can‘t div 0!");
              return 0;
          }else{
              return a / (double)b;
          }

      }
  }

JAVA控制台计算器

原文：https://www.cnblogs.com/langtaoshuo/p/14003048.html