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You've got 3 different kinds of errors.
If you want your Frame / Jantina to implement the ActionListener interface, you have to implement the methods in that interface in Jantina
The second error appears to be an error in an error in an error. There's a CamelCaseClassName capitalisation issue, a missing anonymous inner class implementation - and there's no WindowEventHandler in my copy of the Java API. Where did you get that class name from?
The third one's a bit easier - java statements are all lower case.