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Note that Interfaces often play a software engineering as opposed to required functional role
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For instance, the printable interface (which is fictitious and not part of current Java release) establishs that any class implementing it can be "printed" with a standard method -- "print"
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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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