java - Validate the string length in SWT Text -

i have many modules in project, in every module have text box.

i want validate input(alphabet). have write common method.

need examples.

thanks in advance.

listen swt.verify on text , check condition. if want prevent given input, e.doit = false.

here example allows @ 10 characters in text:

public static void main(string[] args) {     display display = new display();     shell shell = new shell();     shell.settext("stackoverflow");     shell.setlayout(new gridlayout(1, false));      final text text = new text(shell, swt.border);      text.addlistener(swt.verify, new listener()     {         @override         public void handleevent(event e)         {             string olds = text.gettext();             string news = olds.substring(0, e.start) + e.text + olds.substring(e.end);              if(news.length() > 10)                 e.doit = false;         }     });      shell.pack();     shell.open();      while (!shell.isdisposed())     {         if (!display.readanddispatch())         {             display.sleep();         }     }     display.dispose(); }