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Widget can be disposed

import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class WidgetDisposeListener {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     shell.addDisposeListener(new DisposeListener() {       public void widgetDisposed(DisposeEvent e) {         System.out.println(e.widget + " disposed");       }     });     shell.setSize(260, 120);     shell.open();     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }   } }