First full screen

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COMPLETE SOURCE CODE FOR : FullScreenInJava.java
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import java.awt.GraphicsEnvironment;
import java.awt.GraphicsDevice;

import java.awt.Frame;
import java.awt.Window;
import java.awt.Button;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.WindowListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import java.awt.FlowLayout;

import java.awt.Color;

public class FullScreenInJava
{
 public static void main(String[]args)
 {
  GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
  GraphicsDevice gd=ge.getDefaultScreenDevice();
  
  ActionListener al=new ActionListener()
  {
   public void actionPerformed(ActionEvent evt)
   {
    GraphicsEnvironment ge2=GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gd2=ge2.getDefaultScreenDevice();
    gd2.setFullScreenWindow(null);
   } 
  };
  
  Frame a=new Frame();
  
  Button b=new Button("CLICK HERE TO DISABLE FULL SCREEN");
  b.addActionListener(al);
  
  WindowListener wl=new WindowAdapter()
  {
   public void windowClosing(WindowEvent evt)
   {
    System.exit(0);
   } 
  };
  
  a.addWindowListener(wl);
  a.setSize(300,300);
  
  Window c=new Window(a);
  c.setAlwaysOnTop(true);
  c.setLayout(new FlowLayout());
  c.setBackground(Color.DARK_GRAY);
  c.add(b);
  gd.setFullScreenWindow(c);
  c.validate();
 }
}

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JUST COMPILE AND EXECUTE IT
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