Nested classes allow a class to be defined within another class in Java. There are two categories of nested classes - static nested classes which do not have access to other members of the enclosing class, and non-static (inner) classes which do have access to other members of the enclosing class, even private ones. Additionally, local inner classes can be declared within a method body, and anonymous inner classes can be declared within a method body without being named.

1. Inner Classes

2. Nested ClassesThe Java programming language allows you to define a class within another class. Such a class is called a nested classThere are two catagoriesstatic and non-static.Nested classes that are declared static are simply called static nested classes. Non-static nested classes are called inner classes.

3. Points about nested classesA nested class is a member of its enclosing class. Non-static nested classes (inner classes) have access to other members of the enclosing class, even if they are declared private.Static nested classes do not have access to other members of the enclosing class.

4. Local and Anonymous Inner ClassesThere are two additional types of inner classes. You can declare an inner class within the body of a method. Such a class is known as a local inner class. You can also declare an inner class within the body of a method without naming it. These classes are known as anonymous inner classes.

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