Inner class

http://en.wikipedia.org/wiki/Inner_class

http://cafe.naver.com/marinebang.cafe?iframe_url=/ArticleRead.nhn%3Farticleid=5302

 

In object-oriented programming, an inner class(aka nested class) is a class declared entirely within the body of another class or interface. Inner classed became a feature of the Java programming language starting with version 1.1.