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Demonstrate DisposeListener which is notified on the associated widgets disposal

import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class DisposeListenerWithShell {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     shell.setLayout(new GridLayout());     // Create the child shell and the dispose listener     final Shell childShell = new Shell(shell);     childShell.addDisposeListener(new DisposeListener() {       public void widgetDisposed(DisposeEvent event) {          // When the child shell is disposed, change the message on the main shell          System.out.println("Dispoase");       }     });     childShell.setLayout(new FillLayout());     childShell.setText("little brother");     childShell.open();          shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }   } }