Singleton Pattern

Singleton Pattern

The Singleton pattern is a creational design pattern that restricts a class to a single instance and provides a global point of access to that instance.

Factory Pattern

The Factory pattern is a creational design pattern that delegates object creation to a dedicated method or class, so calling code can obtain new instances with…

Builder Pattern

The Builder pattern is a creational design pattern that separates the construction of a complex object from its representation, using a step-by-step builder ob…

Singleton Pattern

Ensures a class has only one instance and provides a single global point of access to it.

Creational Design Patterns Cheat Sheet

Singleton, Factory Method, and Builder patterns for controlling how and when objects get created, with trade-offs for each approach.

Singleton vs Static Class

A Singleton is a regular class restricted to exactly one instance that is still a real object — it can implement interfaces, be passed around, be subclassed, a…

Thread Safety in the Singleton Pattern

Thread safety in the Singleton pattern means guaranteeing that when multiple threads call the accessor concurrently before the instance exists, only one instan…

What is a Thread-Safe Singleton?

A thread-safe Singleton is an implementation of the Singleton pattern that guarantees exactly one instance is created and visible to every thread even when mul…

What is Lazy Initialization in OOP?

Lazy initialization is the technique of deferring the creation of an expensive object or the computation of a value until the exact moment it is first actually…

What is a Private Constructor?

A private constructor is a constructor declared with the private access modifier so it can only be invoked from within its own class, preventing external code…