package com.wolf.action; import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JDialog; import javax.swing.Timer; public class Demo extends Timer {  private static final long serialVersionUID = 2791827603307165823L;  public Demo(int arg0, ActionListener arg1) {   super(arg0, arg1);  }  public static void main(String[] args) {   MyDialog mydialog = new MyDialog();   int height = 150;   TimerAction timerAction = new TimerAction(mydialog);   Timer timer = new Timer(0, timerAction);   timer.start();   for (int i = 0; i < 10; i++) {    try {     Thread.sleep(100);    } catch (InterruptedException e) {     e.printStackTrace();    }    height = height + 5;    timerAction.setHeight(height);   }   timer.stop();   new Demo(1, timerAction);  } } class TimerAction implements ActionListener {  private MyDialog mydialog = null;  private int height = 0;  public void setHeight(int height) {   this.height = height;  }  public TimerAction(MyDialog mydialog) {   this.mydialog = mydialog;  }  public void actionPerformed(ActionEvent event) {   mydialog.setLocation(((int) mydialog.getScreenSize().getWidth()) - 200,     ((int) mydialog.getScreenSize().getHeight() - 20 - height));   mydialog.setSize(new Dimension(200, height));  } } class MyDialog extends JDialog {  private static final long serialVersionUID = 2791827603307165823L;  private Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();  public Dimension getScreenSize() {   return screenSize;  }  public MyDialog() {   super();   init();  }  private void init() {   this.getContentPane().setLayout(new BorderLayout());   this.setLocation(((int) screenSize.getWidth()) - 200,     ((int) screenSize.getHeight() - 20));   this.setVisible(true);   this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);  } }