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Consider the following example: public class Sandbox { public interface Listener<T extends JComponent> { public void onEvent(T event); } public interface AnotherInterface extends Listener<JPanel>, Listener<JLabel> { } } This fails with the following error /media/PQ-WDFILES/programming/Sandbox/src/Sandbox.java:20: Sandbox.Listener cannot be inherited with different arguments: <javax.swing.JPanel> and <javax.swing.JLabel> public interface AnotherInterface extends Listener<JPanel>, Listener<JLabel> { ^ 1 error Why though? There is no overlap in the generated methods. As a matter of fact, that essentially means public interface AnotherInterface { public void onEvent(JPanel event); public void onEvent(JLabel event); } No overlap there. So why is it failing? In case your wondering what I'm doing and have a better solution: I have a bunch of Events and a Listener interface that's almost exactly like the Listener class above. I'm wanting to create an adapter and an adapter interface, and for that I need to extend all the Listener interfaces with a specific event. Is this possible? Is there a better way to do this?

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