JFrame fullscreen

Source code below will show you, how to set JFrame to full screen follow to current computer screen

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COMPLETE SOURCE CODE FOR : FullScreenJFrame.java
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import javax.swing.JFrame;

import java.awt.Toolkit;

public class FullScreenJFrame
{
public static void main(String[]args)
{
 //Create a JFrame with title ( Full Screen JFrame )
 JFrame frame=new JFrame("Full Screen JFrame");

 //Set default close operation for JFrame
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 //Set JFrame size to full screen size follow current screen size
 frame.setSize(Toolkit.getDefaultToolkit().getScreenSize().width,Toolkit.getDefaultToolkit().getScreenSize().height);

 //Make JFrame visible
 frame.setVisible(true);
}
}

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JUST COMPILE AND EXECUTE IT
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Second full screen

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COMPLETE SOURCE CODE FOR : FullScreenInJava2.java
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import java.awt.Frame;
import java.awt.Button;

import java.awt.Dimension;
import java.awt.Toolkit;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import java.awt.FlowLayout;

public class FullScreenInJava2
{
 public static void main(String[]args)
 {
  Frame a=new Frame();
  Button b=new Button("CLICK HERE TO DISABLE FULL SCREEN");
  
  ActionListener al=new ActionListener()
  {
   public void actionPerformed(ActionEvent evt)
   {
    System.exit(0);
   } 
  };
  
  b.addActionListener(al);
  
  a.setLayout(new FlowLayout());
  a.add(b);
  
  a.setSize((Toolkit.getDefaultToolkit().getScreenSize()).width,(Toolkit.getDefaultToolkit().getScreenSize()).height);
  a.setUndecorated(true);
  a.setAlwaysOnTop(true);
  a.setVisible(true);
 }
}

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JUST COMPILE AND EXECUTE IT
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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();
 }
}

********************************************************************
JUST COMPILE AND EXECUTE IT
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Determine platform support for full screen

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COMPLETE SOURCE CODE FOR : DetermineFullScreenSupport.java
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import java.awt.Frame;
import java.awt.Window;

import java.awt.GraphicsEnvironment;
import java.awt.GraphicsDevice;

public class DetermineFullScreenSupport
{
 public static void main(String[]args)
 {
  GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
  GraphicsDevice gd=ge.getDefaultScreenDevice();
  
  if(gd.isFullScreenSupported())
  {
   System.out.println("FULL SCREEN SUPPORTED");
  }
  else
  {
   System.out.println("FULL SCREEN NOT SUPPORTED");
  }
 }
}

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JUST COMPILE AND EXECUTE IT
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