Advantage of Java inner classes

There are three advantages of inner classes in Java. They are as follows:

• Nested classes represent a particular type of relationship that is it can access all the members (data members and methods) of the outer class, including private.
• Nested classes are used to develop more readable and maintainable code because it logically group classes and interfaces in one place only.
• Code Optimization: It requires less code to write.

Sometimes users need to program a class in such a way so that no other class can access it. Therefore, it would be better if you include it within other classes. If all the class objects are a part of the outer object then it is easier to nest that class inside the outer class. That way all the outer class can access all the objects of the inner class.