Indexer
http://dis.dankook.ac.kr/lectures/hci09/entry/Indexer

Property (속성)
http://dis.dankook.ac.kr/lectures/hci09/entry/Property

Method overloading (메소드 오버로딩) Method overriding (메소드 오버라이딩)
http://dis.dankook.ac.kr/lectures/hci09/entry/Method-Overloading

Abstract Class (추상 클래스)
http://dis.dankook.ac.kr/lectures/hci09/entry/Abstract-class

Sealed Class (봉인 클래스)
http://dis.dankook.ac.kr/lectures/hci09/entry/Sealed-Class