What are the purposes of inner classes

Question

I am reviewing the concept of inner classes in java. so far from what I\'ve understood and applied java inner classes has a link or access to the methods and fields of its o

Answer 1

This is a style question. Anything that can be done with an inner class can also be done as a as series of external classes. Inner classes are especially useful for classes that are lightweight or tightly bound to the enclosing class. For example, a comparator is frequently both these things. It needs intimate knowledge of the implementation of the class, and may only be a few lines long. It may be an ideal candidate as an internal class.