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Note that Interfaces often play a software engineering as opposed to required functional role
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Note that Interfaces are not significantly used in current Java release where perhaps there are 15 times as many class definitions as interface definitions
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Two examples are Runnable and Cloneable both of which extend Object class -- note interfaces like classes can extend existing classes.
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The Runnable Interface has one method run() which must always be overwritten and is used to indicate that class with this interface can use threads without being a subclass of Thread. Applets must use Runnable if they need explicit threads because they explicitly are a subclass of panel and as no multiple inheritance, one cannot be a subclass of two classes
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