Calculator in Java Swing

import java.util.Scanner;

public class Cal {

public static void main(String[] args) {
    int a,b,i;
    System.out.println("Enter The Value Of A and B");
    Scanner sc=new Scanner(System.in);
    a=sc.nextInt();
    b=sc.nextInt();
    System.out.println("Enter 1 for Add");
    System.out.println("Enter 2 for Sub");
    System.out.println("Enter 3 for Multi");
    System.out.println("Enter 4 for Divide");
    i=sc.nextInt();

    switch (i)
    {
            case 1:
                System.out.println("Add is "+(a+b));  
                break;
            case 2:
                System.out.println("Sub is "+(a-b));
                break;
            case 3:
                System.out.println("Multi is "+(a*b));
                break;
            case 4:
                System.out.println("Divide is "+(a/b));
                break;
            default:
                System.out.println("Please Enter Correct Value");
                break;


}
}

}