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Java OOPS Interview Questions
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Answered by: ssalguti
View all answers by ssalguti
Member Since Apr-2008 | Answered On : Apr 25th, 2008
Logical grouping of classes—If a class is useful to only one other class, then it is logical to embed it in that class and keep the two together. Nesting such "helper classes" makes their package more streamlined.
Increased encapsulation—Consider two top-level classes, A and B, where B needs access to members of A that would otherwise be declared private. By hiding class B within class A, A's members can be declared private and B can access them. In addition, B itself can be hidden from the outside world.
More readable, maintainable code—Nesting small classes within top-level classes places the code closer to where it is used.
Defining a class within another class is known as nested class.
If class B is defined within class A, then B is known to A, but not outside of A.
Class B has access to the members, including private members of the Class A.
However,the class A does not have access to the members of Class B.
Logical grouping of classes—If a class is useful to only one other class, then it is logical to embed it in that class and keep the two together. Nesting such "helper classes" makes th...