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. In this short tutorial, we’ll be looking at inner interfaces in Java. They are mainly used for: 1. solving the namespacing issue when the interface has a common name 2. increasing encapsulation 3. increasing readability by grouping related interfaces in one place A well-known example is the Entry interface which is declared inside the Map interface...
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