Singleton Pattern — Java & C++ Examples

This repository provides a minimal and easy-to-understand implementation of the Singleton design pattern in Java and C++. The goal is to help students learn how the pattern works, why it is used, and how to run simple example implementations on their own.

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📌 What is the Singleton Pattern?

The Singleton pattern ensures that a class has only one instance during the program’s lifetime and provides a global point of access to it.

Typical use cases include:

• Configuration managers
• Logger classes
• Database connection managers
• Global state containers

Both examples in this repository demonstrate:

• A private constructor
• A static method that returns the single instance
• Prevention of copying or instantiation from outside

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✔ Java Example (Geeks.java)

This file shows a classical lazy-initialized Singleton in Java.

✔ C++ Example (main.cpp)

This file demonstrates a simple pointer-based Singleton implementation in C++ (and confirms that two calls return the same instance). The example corresponds to the uploaded code .

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▶ How to Run the Examples

Run the Java Version

1. Navigate to the folder:

   cd java

2. Compile:

   javac Geeks.java

3. Run:

   java Geeks

Run the C++ Version

1. Navigate to the folder:

   cd cpp

2. Compile:

   g++ main.cpp -o singleton

3. Run:

   ./singleton

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🧠 Learning Objectives

By experimenting with these files, you will learn:

• How Singleton works in Java and C++
• How constructors are hidden to prevent multiple instances
• How static methods provide access to the single object
• How memory allocation differs between languages (JVM vs manual C++)
• Why Singleton must block copying (deleted copy constructor in C++)

🎓 License & Usage

This repository is created purely for educational purposes.

You are encouraged to modify the examples and experiment with alternative Singleton implementations.