Chapter 9. Interfaces
An interface declaration introduces a new reference type whose members are classes, interfaces, constants, and methods. This type has no instance variables, and typically declares one or more abstract methods; otherwise unrelated classes can implement the interface by providing implementations for its abstract methods. Interfaces may not be directly instantiated.
A nested interface is any interface whose declaration occurs within the body of another class or interface.
A top level interface is an interface that is not a nested interface.
We distinguish between two kinds of interfaces - normal interfaces and annotation types.
This chapter discusses the common semantics of all interfaces - normal interfaces, both top level ...
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