EDT Example

Unresponsive.java

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

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class Unresponsive extends JFrame implements ActionListener{

        public Unresponsive() {
		super("Unresponsive");
		JButton frame = new JButton("Unresponsive");
		frame.addActionListener(this);
		add(frame);
		pack();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	
	@Override
	public void actionPerformed(ActionEvent arg0) {	
			/*
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			*/
			Thread t = new Thread(new Runnable() {
				public void run() {
					// do something that takes long here
					SwingUtilities.invokeLater(new Runnable() {
						@Override
						public void run() {
							// update GUI
						}
					});
				}
			});
			t.start();
	}
	
	public static void main(String[] args) {
		/*
		Unresponsive edt = new Unresponsive();
		edt.setVisible(true);
		*/
		
		SwingUtilities.invokeLater(new Runnable() {
			@Override
			public void run() {
				Unresponsive edt = new Unresponsive();
				edt.setVisible(true);
			}
		});
		
	}
	
}