Singleton

Singleton is a creational design pattern that ensures a class has only one instance and provides a global point of access to that instance.

• Instance Control: The Singleton pattern is used when you want to ensure that a class has only one instance and provide a way to access that instance from any part of the application.

• Global Access: By providing a global point of access to the instance, the Singleton pattern allows you to access the same instance from multiple parts of the codebase without the need to pass references around.

Example:

public class Singleton {
    private static Singleton instance;

    private Singleton() {
        // Private constructor to prevent instantiation
    }

    public static Singleton getInstance() {
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }
}

Usage:

Singleton singleton = Singleton.getInstance();