When the button is created, it should have at least one listener class added to its list of listeners:
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button1.addActionListener ( eventclass );
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where eventclass is an instance of the listener class.
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every component which can cause an event called X, has methods addXListener and removeXListener.
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Then this class must implement the interface ActionListener. This interface requires only one event handler method:
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public class EventClass implements ActionListener
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{
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public void actionPerformed ( ActionEvent e) { ... }
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}
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If the event source class is acting as its own listener, then you just say
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button1.addActionListener ( this );
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