title: JFrame action listener - Erron
body: <p>I have create a Java application using xcode. In that application i am getting the error in the following declaration -</p>
  
  <p>Public class testapp extends JFrame implements ActionListener{}</p>
  
  <p>the error is - 
  "testapp is not abstract &amp; does not override abstract method actionPerformed (java.awt.event_ActionEvents) in java.awt.events_ActionListener"</p>