Private static variable of the same class that is the only instance of the class.Private constructor to restrict instantiation of the class from other classes.In order to implement a Singleton pattern, we have different scenarios, but each of them has the following common approach. How to implement a Singleton Design Pattern in general? There are only two points in the definition of a singleton design pattern, 1) There should be only one instance allowed for a class and 2) We should allow global point of access to that single instance. We can even see the usage of Singleton design pattern in core java classes also. Some of the usage of the Singleton pattern are in thread pool, logging, caching, driver objects etc. If in your solution some object has only one instance and you want to model that in your design then you should use singleton pattern. Singleton pattern is generally useful when the object that is created once and shared across different threads/applications. The singleton class must provide a global access point to get the instance of the class. The Singleton Pattern puts restriction on the instantiation of a class and ensures that only one instance of the class exists in the java virtual machine. ![]()
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