Leave full-screen mode (Return to normal windowed mode) : Full Screen « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. Full Screen

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Main {
  public static void main(String[] argv) throws Exception {
     GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
     GraphicsDevice gs = ge.getDefaultScreenDevice();
     gs.setFullScreenWindow(null);
  }
}