Thread: hi everyone!! I'm new to java programming.. can you help me out? please

hi everyone!! I'm new to java programming.. Can you help me out? please?

I made a simple calculator program, and i don't know if it's right.. There's no errors but it won't run? please help me solve my problem.. Thanks in advance..

 
package simplecalculator;
 
import javax.swing.*;
import java.util.Scanner;
 
public class simplecalculator
{
    static Scanner input = new Scanner(System.in);
 
    public static void main(String[] args)
    {
        int choice;
 
            do{
            System.out.println(" *************************** ");
            System.out.println("     Tonelete's Calculator   ");
            System.out.println(" *************************** ");
            System.out.println("                             ");
            System.out.println("      (a) ADDITION           ");
            System.out.println("      (b) SUBTRACTION        ");
            System.out.println("      (c) MULTIPLICATION     ");
            System.out.println("      (d) DIVISION           ");
            System.out.println("      (e) QUIT               ");
            System.out.println("                             ");
            System.out.println(" *************************** ");
            System.out.println("Your choice: ");
            choice = input.nextInt();
            }while (choice < 'a' || choice > 'e');
 
            switch (choice)
            {
                case 'a':
                    add();
                    break;
 
                case 'b':
                    minus();
                    break;
 
                case 'c':
                    times();
                    break;
 
                case 'd':
                    divide();
                    break;
 
                case 'e':
                    System.exit(0);
                    break;
            }
 
        }
 
    private static void add() {
        int x, y, sum = 0;
        int again;
        String output;
 
                    JOptionPane.showMessageDialog(null, "ADDITION");
                        x = Integer.parseInt
                            (JOptionPane.showInputDialog(null, "Enter first Number"));
                        y = Integer.parseInt
                            (JOptionPane.showInputDialog(null, "Enter second Number"));
                    sum = x + y;
                    output = "The Sum is " + sum + ".";
                    JOptionPane.showMessageDialog(null, output);
                    System.out.println("Try Again? (Y/N):  ");
                    again = input.next().charAt(0);
           if (again == 'Y' || again == 'y');
    }
 
    private static void minus() {
        int x, y, difference = 0;
        int again;
 
        String output;
 
                    JOptionPane.showMessageDialog(null, "SUBTRACTION");
                        x = Integer.parseInt
                            (JOptionPane.showInputDialog(null, "Enter first Number"));
                        y = Integer.parseInt
                            (JOptionPane.showInputDialog(null, "Enter second Number"));
                    difference = x - y;
                    output = "The difference is " + difference + ".";
                    JOptionPane.showMessageDialog(null, output);
                    System.out.println("Try Again? (Y/N):  ");
                    again = input.next().charAt(0);
           if (again == 'Y' || again == 'y');
    }
 
    private static void times() {
        int x, y, product = 0;
        int again;
 
        String output;
 
                    JOptionPane.showMessageDialog(null, "MULTIPLICATION");
                        x = Integer.parseInt
                            (JOptionPane.showInputDialog(null, "Enter first Number"));
                        y = Integer.parseInt
                            (JOptionPane.showInputDialog(null, "Enter second Number"));
                    product = x * y;
                    output = "The Product is " + product + ".";
                    JOptionPane.showMessageDialog(null, output);
                    System.out.println("Try Again? (Y/N):  ");
                    again = input.next().charAt(0);
           if (again == 'Y' || again == 'y');
    }
 
     private static void divide() {
         int x, y;
         double quotient;
         int again;
 
         String output;
 
                    JOptionPane.showMessageDialog(null, "DIVISION");
                        x = (int) Double.parseDouble
                            (JOptionPane.showInputDialog(null, "Enter first Number"));
                        y = (int) Double.parseDouble
                            (JOptionPane.showInputDialog(null, "Enter second Number"));
                    quotient = x / y;
                    output = "The Quotient is " + quotient + ".";
                    JOptionPane.showMessageDialog(null, output);
                    System.out.println("Try Again? (Y/N):  ");
                    again = input.next().charAt(0);
           if (again == 'Y' || again == 'y');
    }
}

THANKS in ADVANCE...

but it won't run

Please explain what happens when you try to execute it.