Using Multiple Threads With a Swing GUI

SwingGUIDemo.java

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

/**
 * This class is an example of how to correctly startup a GUI interface
 * 
 * From Oracle's Java Tutorial:
 * http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
 * 
 * @author kaydell
 *
 */
public class SwingGUIDemo extends JFrame {
	
	/**
	 * This constructor creates a simple window
	 */
	public SwingGUIDemo() {
		
		// add a label to this window
		JLabel jLabel = new JLabel("Hello Multithreading", JLabel.CENTER);
		this.add(jLabel);
		
		// finish initializing this window
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // exit app when this window is closed.  Good when there's only one window
		setSize(500,200); // size this window
		setLocationRelativeTo(null); // center this window
	}
	
	/**
	 * This main method is rather complex, but it demonstrates the correct way to
	 * start a Swing GUI.  This way of creating a GUI window is especially necessary 
	 * when using multiple threads.
	 * 
	 * @param args Not used
	 */
	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable() {
			@Override
			public void run() {
				SwingGUIDemo demoFrame = new SwingGUIDemo();
				demoFrame.setVisible(true); // setVisible(true) should be called last
			}
		});
	}

}