view model verify verify actionPerformed actionPerformed actionPerformed InputVerifier NumericVerifier ShowListener ResetListener SaveListener setName getName getAlter setAlter name alter MDAam BeispielMVC actionPerformed Model ActionListener reset setTfName tfName jbReset save lblAlter lblName show jbShow getTfName exit tfAlter getTfAlter jbSave setTfAlter jbExit view2Model model2View Controller View 3-MVC-Pattern-Design