[디자인 패턴] 싱글톤 패턴

[디자인 패턴] 싱글톤 패턴 (Singleton Pattern)

http://itdp1024.tistory.com/entry/%EB%94%94%EC%9E%90%EC%9D%B8-%ED%8C%A8%ED%84%B4-%EC%8B%B1%EA%B8%80%ED%86%A4-%ED%8C%A8%ED%84%B4-Singleton-Pattern