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Create filled rectangles using the fillRectangle() methods

import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class FillRectangle {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     shell.setText("Canvas Example");     shell.setLayout(new FillLayout());     Canvas canvas = new Canvas(shell, SWT.NONE);     canvas.addPaintListener(new PaintListener() {       public void paintControl(PaintEvent e) {         e.gc.setBackground(e.display.getSystemColor(SWT.COLOR_RED));         e.gc.fillRectangle(30, 40, 400, 200);       }     });     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }