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SWT provides two kinds of event listening mechanism

A typed listener can be used to listen for only one particular typed event. For example, SelectionListener is a typed listener for event SelectionEvent. Untyped event listeners offer a generic, low-level mechanism to listen for events. import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class GenericEventUntyped {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     shell.setLayout(new GridLayout());     Button button = new Button(shell, SWT.NONE);     button.setText("Click and check the console");     button.addSelectionListener(new SelectionListener() {       public void widgetSelected(SelectionEvent arg0) {         System.out.println("widgetSelected");       }       public void widgetDefaultSelected(SelectionEvent arg0) {         System.out.println("widgetDefaultSelected");       }     });     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }   } }