An interfaces specifies a collection of methods without implementing their bodies.
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public interface Storable {
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public void store(Stream s);
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public void retrieve(Stream s);
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}
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Interfaces are used to indicate that a class has a certain behavior (has certain methods) without conveying anything else about the class.
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Interfaces solve some of the same problems as multiple inheritance, without as much overhead at runtime.
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There is a small performance penalty because interfaces involve dynamic method binding.
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Interfaces can be implemented by classes on unrelated inferitance trees, making it unnecessary to add methods to common superclass.
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