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Using SelectionListener

import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; 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 ButtonSelectionListener {   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 SelectionAdapter() {       public void widgetSelected(SelectionEvent event) {         System.out.println("selection event");       }     });     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }   } }