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The Java™ Tutorials
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Summary of Interfaces
Trail: Learning the Java Language
Lesson: Interfaces and Inheritance
Section: Interfaces

Summary of Interfaces

An interface declaration can contain method signatures, default methods, static methods and constant definitions. The only methods that have implementations are default and static methods.

A class that implements an interface must implement all the methods declared in the interface.

An interface name can be used anywhere a type can be used.


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