Singleton class 설계

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Singleton class  Basic type

 

 

public class Singleton {
	private volatile static Singleton uniqueInstance = null;
	
	private Singleton() {}
	public static Singleton getInstance (){
		if ( uniqueInstance == null){
			synchronized( Singleton.class){
				if (uniqueInstance == null)
					uniqueInstance = new Singleton();
			}
		}
		return uniqueInstance;
	}
}