Web Reference: Nov 14, 2025 · In Java, a Nested Interface is an interface declared inside a class or another interface. In Java, nested interfaces can be declared with the public, protected, package-private (default), or private access specifiers. The question has been answered, but one good reason to use a nested interface is if its function is directly related to the class it is in. A good example of this is a Listener. In Java, an interface defined inside another interface or class is called nested interface. Interfaces are similar to classes, but they not contain instance variables, and their methods are declared without any body.
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