Inner class may be static

Kotlin Inner class In other words, we can say that a nested class which is marked as “inner” is called inner class . Inner class cannot be declared inside interfaces or non-inner nested classes. The advantage of inner class over nested class is that, it is able to access members of outer class even it is private.

Simply put, Java allows us to define classes inside other classes. Nested classes enable us to logically group classes that are only used in one place, write more readable and maintainable code and increase encapsulation .

inner class: Can only exist withing the instance of its enclosing class. Has access to all members. local class: class declared in a block. It is like an inner class (has access to all members) but it also has access to local scope.