... continued

Implementing a thread-safe Singleton class is a popular interview question with the double checked locking as the most debated implementation. For completeness, we present below all the various evolutions of the Singleton pattern in Java.

• The easiest way to create a singleton is to mark the constructor of the class private and create a private static instance of the class that is initialized inline. The instance is returned through a public getter method. The drawback of this approach is if the singleton object is never used then we have spent ...