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/* Apply DCL(Double Check Lock) */
public class Singleton {
	private volatile static Singleton instance = null;


	private Singleton() {};

	public static final Singleton getInstance() {
		if (instance == null) {
			synchronized(Singleton.class) {
				if (instance == null) {
					instance = new Singleton();
				}
			}
		}

		return instance;	
	}
}