import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;


public   class   testFullScrean   
{   
public   static   void   main(String[]   args)   
{   
final   JFrame   f   =   new   JFrame("FullScreenTest");   
final   JButton   btn   =   new   JButton("FullScreen");   
btn.addActionListener(new   ActionListener()   
{   
public   void   actionPerformed(ActionEvent   e)   
{   
if   (btn.getText().equals("FullScreen"))   {   
f.dispose();   
f.setUndecorated(true);   
  
Dimension   screenSize   =   Toolkit.getDefaultToolkit().getScreenSize();   
Rectangle   bounds   =   new   Rectangle(screenSize);   
Insets   insets   =   Toolkit.getDefaultToolkit().getScreenInsets(f.getGraphicsConfiguration());   
bounds.x   +=   insets.left;   
bounds.y   +=   insets.top;   
bounds.width   -=   insets.left   +   insets.right;   
bounds.height   +=   insets.top   +  insets.bottom;   
  
f.setBounds(bounds);   
f.setVisible(true);   
btn.setText("NormalMode");   
}   
else   {   
f.dispose();   
f.setUndecorated(false);   
f.pack();   
f.setLocationRelativeTo(null);   
f.setVisible(true);   
btn.setText("FullScreen");   
}   
}


});   
  
f.getContentPane().setLayout(new   FlowLayout());   
f.getContentPane().add(btn);   
f.pack();   
f.setLocationRelativeTo(null);   
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   
f.setVisible(true);   
}   
}