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public class SingletonLock {
	
	  private static SingletonLock singl = null;
	  
	  public synchronized static SingletonLock getInstance() {
	    if (singl==null)
	      singl = new SingletonLock(); // una sola istanza
	    return singl;
	 }

	  private SingletonLock() {
	  }
}

Codice: Seleziona tutto

public class SingletonClass{
	/**
	 * Singleton instance holder
	 */
	private static class SingletonHolder {
		public static SingletonClass instance = new SingletonClass();
	}

	/**
	 * Singleton entry-point. Returns the only instance in the system.
	 */
	public static SingletonClass getInstance() {
		return SingletonHolder.instance;
	}

	private SingletonClass() {
		// Costruttore reale
	}
 }

Codice: Seleziona tutto

SingletonClass lock = SingletonClass.getInstance()