java - Validation of mobile number field -

i want know what's wrong code? taking input in textbox(a 10-digit mobile number). problem that, code time prints else statement if input correct.

mobno=textmobno.gettext();  textmobno.addfocuslistener(new focuslistener() {      @override     public void focuslost(focusevent arg0) {         // todo auto-generated method stub          pattern pattern = pattern.compile("^[789]\\d{9}$");         matcher matcher = pattern.matcher(mobno);          if (matcher.matches()){             system.out.println("valid");         }         else{             system.out.println("invalid");         }            }      @override     public void focusgained(focusevent arg0) {         // todo auto-generated method stub      }; }); 

you obtaining text text field, adding focuslistener. @ later time, focus listener fired, uses text got field before focus listener active. yeah, text before typed in field; explain being empty string. try getting text in focus listener... (hint - string text field not continually updated text typed in field...)