Java

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Singleton

A correct threadsafe Java lazy-loaded solution known as the "Initialization On Demand Holder" idiom suggested by Bill Pugh follows:

public class Singleton {
    // Private constructor suppresses generation of a (public) default constructor
    private Singleton() {}

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

    private static class SingletonHolder {
           private static Singleton instance = new Singleton();
    }
}

See: Singleton pattern