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. An interface defined inside another interface or class is known as nested interface. This tutorial explains how to declare and implement nested interface in java with examples. 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.
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