what is meant by "Classname is not abstract and does not override abstract method actionlistenerPerformed(java.awt.event.ActionEvent)in java.awt.event.actionListener" ?
When we implement an interface(ActionListener) or extend an abstract class in a concrete class, we must override the abstract method(s). This error occurs when you implement the ActionListener but does not override the abstract method actionPerformed.
For implementing an interface or extending an abstract class, we must override all of the abstract methods (if more than one), though we do not need all.
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