Java by API/org.eclipse.jface.dialogs/InputDialog

new InputDialog(Shell parentShell, String dialogTitle, String dialogMessage, String initialValue, IInputValidator validator)

   <source lang="java">

import org.eclipse.jface.dialogs.IInputValidator; import org.eclipse.jface.dialogs.InputDialog; import org.eclipse.jface.window.ApplicationWindow; import org.eclipse.jface.window.Window; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class MainClass extends ApplicationWindow {

 public MainClass() {
   super(null);
 }
 public void run() {
   setBlockOnOpen(true);
   open();
   Display.getCurrent().dispose();
 }
 protected void configureShell(Shell shell) {
   super.configureShell(shell);
   shell.setText("Send Message");
   shell.setSize(500, 400);
   InputDialog dlg = new InputDialog(Display.getCurrent().getActiveShell(),
       "", "Enter 5-8 characters", "info", new LengthValidator());
   if (dlg.open() == Window.OK) {
     System.out.println(dlg.getValue());
   }
 }
 public static void main(String[] args) {
   new MainClass().run();
 }

} class LengthValidator implements IInputValidator {

 public String isValid(String newText) {
   int len = newText.length();
   if (len < 5) return "Too short";
   if (len > 8) return "Too long";
   return null;
 }

}

      </source>