What are the purposes of inner classes

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Inner classes are best for the purpose of logically grouping classes that are used in one-place. For example, if you want to create class which is used by ONLY enclosing class, then it doesn’t make sense to create a separate file for that. Instead you can add it as “inner class”

As per java tutorial:

Compelling reasons for using nested classes include the following:

  • It is a way of logically grouping classes that are only used in one
    place.
  • It increases encapsulation.
  • It can lead to more readable and maintainable code.

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