Swt non-ui thread example. A clock app.

Clock.java

package test;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public class Clock {

	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		Label label = new Label(shell, SWT.NONE);
		label.setText(new SimpleDateFormat("HH:mm:ss").format(new Date()));
		new Thread() {
			public void run() {
				while(true) {
					try {
						Thread.sleep(1000);
						display.asyncExec(new Runnable() {
							@Override
							public void run() {
								label.setText(new SimpleDateFormat("HH:mm:ss").format(new Date()));
							}
						});
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		}.start();
		shell.setLayout(new RowLayout());
		shell.pack();
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}