Design Pattern

Singleton classes are a fundamental design pattern in Java, used when you want to ensure that a class has only one instance and provide a global point of access to that instance. This pattern is invaluable when precisely one object is needed to coordinate actions across the system, such as a configuration manager, thread pool, or database connection. In this guide, we will explore various ways to create singleton classes in Java.

In Java, immutability is a key concept in object-oriented programming. An immutable class is one whose state cannot be modified after it has been created. Immutable classes provide numerous benefits, including thread safety, ease of use, and robustness in concurrent programming. In this guide, we will explore the principles of creating immutable classes in Java and demonstrate step-by-step how to implement them effectively.