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Draw Oval

import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class DrawOval {   public static void main(String[] args) {     final Display display = new Display();     final Shell shell = new Shell(display);     shell.addPaintListener(new PaintListener() {       public void paintControl(PaintEvent event) {         Rectangle rect = shell.getClientArea();         event.gc.drawOval(0, 0, rect.width - 1, rect.height - 1);       }     });     shell.setBounds(10, 10, 200, 200);     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch())         display.sleep();     }     display.dispose();   } }