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Using VerifyListener

import org.eclipse.swt.SWT; import org.eclipse.swt.events.VerifyEvent; import org.eclipse.swt.events.VerifyListener; import org.eclipse.swt.layout.RowLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class VerifyListenerUsing {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     shell.setLayout(new RowLayout());     Text text = new Text(shell, SWT.SINGLE | SWT.BORDER);     text.setText("Type somthing to verify.");     text.addVerifyListener(new VerifyListener(){       public void verifyText(VerifyEvent arg0) {         System.out.println("verifying");                }});     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }