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;
}

}
}