java swing maximized jframe at startup

/**
 * @author lautturi.com 
 * Java example: Maximize the jframe window
 */

import java.util.*;
import javax.swing.JFrame;
public class Lautturi {

	public static void main(String[] args) {
		JFrame frame = new JFrame();
		
		frame.setTitle("My First GUI");
		frame.setSize(500,300);
		frame.setLocationRelativeTo(null); // put jframe in center of screen
		frame.setExtendedState(java.awt.Frame.MAXIMIZED_BOTH);
		frame.setVisible(true);
	}
}