LazySingletonThreadSafe1.java

public class LazySingleton {

    private LazySingleton() {
    }

    private static LazySingleton sInstance;

    public static LazySingleton INSTANCE() {
        
        synchronized (LazySingleton.class) {
            if (sInstance == null) {
                sInstance = new LazySingleton();
            }
        }
        return sInstance;
    }
}