Web Reference: Jul 23, 2025 · In Java, it is possible to define a class within another class, such classes are known as nested classes. They enable you to logically group classes that are only used in one place, thus this increases the use of encapsulation and creates more readable and maintainable code. Compelling reasons for using nested classes include the following: 1. It is a way of logically grouping classes that are only used in one place: If a class is useful to only one other class, then it is logical to embed it in that class and keep the two together. Nesting such "helper classes" makes their package more streamlined. 2. It increases enc... In this tutorial, you will learn about the nested class in Java and its types with the help of examples. You can define a class within another class. Such class is known as nested class.
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