Java Singleton

Singleton.java

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