51 - Java Serialization with Singleton pattern and readResolve() - Theory

@backstreetbrogrammer -------------------------------------------------------------------------------- Chapter 20 - Java Serialization Singleton pattern and readResolve() - Theory -------------------------------------------------------------------------------- In software engineering, the Singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. The pattern is useful when exactly one object is needed to coordinate actions across a system. More specifically, the singleton pattern allows objects to: - Ensure they only have one instance - Provide easy access to that instance - Control their instantiation by hiding the constructors of a class As we know that deserialization process will always contain the “copy” of the original object =: thus it will break the singleton design pattern as only ONE and SAME instance has to be there in a current JVM run. In other words, any class would no longer be a singleton