contoh JOptionPane

import javax.swing.*;

/**
 * JOptionPane showInputDialog example #1.
 * A simple showInputDialog example.
 * @author alvin alexander, http://alvinalexander.com
 */
public class JOptionPaneShowInputDialogExample1
{
  public static void main(String[] args)
  {
    // a jframe here isn't strictly necessary, but it makes the example a little more real
    JFrame frame = new JFrame("InputDialog Example #1");

    // prompt the user to enter their name
    String name = JOptionPane.showInputDialog(frame, "What's your name?");

JOptionPane.showMessageDialog(frame,"my name is "+name);
    // get the user's input. note that if they press Cancel, 'name' will be null
    System.out.printf("The user's name is '%s'.\n", name);
 System.exit(0);
  }
}
//original source: http://alvinalexander.com/java/joptionpane-showinputdialog-examples