如果输入特定数字，如何弹出特定窗口

Question

I was wondering how do i make a certain window pop up if I input a certain number for my java program.

import javax.swing.JOptionPane;

public class Calculator_Menu
{
public static void main (String args [])
{
String MainMenu = " Calculator Options \n\n1. Addition\n2" +
" Subtraction\n3. Multiplication\n4. Division\n5. Exit";

    menu (MainMenu);
}

public static String menu (String info)
{
    String choice = JOptionPane.showInputDialog (info);
    return choice;
}

public static int Addition ()
{ 

Answer 1

If you are looking to just have a window pop up to display the number, you could use something like showMessageDialog with an if statement -

Code:

if (choice == desiredNumber) {
    JOptionPane.showMessageDialog(null,choice);
}

You need to import javax.swing.JOptionPane for this to work.