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//*** Initialization-on-demand holder idiom
public class Singleton {
        // Private constructor. Prevents instantiation from other classes.
        private Singleton() { }

        /**
         * Initializes singleton.
         *
         * {@link SingletonHolder} is loaded on the first execution of {@link Singleton#getInstance()} or the first access to
         * {@link SingletonHolder#INSTANCE}, not before.
         */
        private static class SingletonHolder {
                private static final Singleton INSTANCE = new Singleton();
        }

        public static Singleton getInstance() {
                return SingletonHolder.INSTANCE;
        }
}