Java Swing How to - Change display mode

Question

We would like to know how to change display mode.
Answer

//w  ww. ja  v a  2s  .c o m
import java.awt.DisplayMode;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class Main {

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setSize(800, 600);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    GraphicsDevice device = GraphicsEnvironment.getLocalGraphicsEnvironment()
        .getDefaultScreenDevice();
    device.setFullScreenWindow(frame);
    device.setDisplayMode(new DisplayMode(800, 600, 32, 60));
    frame.setVisible(true);

    JButton btn = new JButton();
    btn.setText("Button");
    JPanel panel = new JPanel();

    panel.add(btn);
    frame.add(panel);

    btn.addActionListener(e->{
        JOptionPane.showMessageDialog(frame.getContentPane(), "JOptionPane");
    });
  }
}