Spring 5 Design Patterns

Singleton design pattern

Ensure a class has only one instance and provide a global point of access to it - GOF Design Patterns

The Singleton pattern is a creational design pattern, it is one of the simplest design patterns in Java. According to the singleton design pattern, the class provides the same single object for each call--that is, it is restricting the instantiation of a class to one object and provides a global point of access to that class. So the class is responsible for creating an object and also ensures that only a single object should be created for each client call for this object. This class doesn't allow a direct instantiation of an object of this class. It allows you to get an object instance only by an exposed static method. ...