InputDialog

import javax.swing.*;
import java.awt.event.*;
 
public class ShowInputDialog{
 //Konstruktor
 public ShowInputDialog(){
  JFrame frame = new JFrame("Input Dialog Box Frame");
  JButton button = new JButton("Show Input Dialog Box");
  button.addActionListener(new ActionListener(){
  public void actionPerformed(ActionEvent ae){
   String str = JOptionPane.showInputDialog(null, "Gib einen Text ein: ", "roy-bohn.de", 1);
   if(str != null){
    JOptionPane.showMessageDialog(null, "Du hast: " + str + " eingegeben", "roy-bohn.de", 1);
   }
   else
   JOptionPane.showMessageDialog(null, "Abbruch...", "roy-bohn.de", 1);
  }
 });
 JPanel panel = new JPanel();
 panel.add(button);
 frame.add(panel);
 frame.setSize(400, 400);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setVisible(true);
 }
}