🧩 Singleton Design Pattern using Logger (Java)

📌 Overview

This project demonstrates the Singleton Design Pattern using a Logger example in Java.

The purpose of this repository is to help students and beginners understand Singleton:

• Why it is needed
• How it works
• How it is applied in real-world systems (like logging)

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❓ What is the Singleton Design Pattern?

The Singleton Design Pattern is a creational design pattern that ensures:

• Only one instance of a class exists throughout the application
• That instance is globally accessible

In simple terms:
One class → One object → Shared everywhere

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📝 Why Logger Should Be a Singleton

Logging is a shared service used by many parts of an application.

Problems if Logger is NOT Singleton:

• Multiple Logger objects created
• Multiple log files opened
• Inconsistent log messages
• File access conflicts
• Higher memory usage

Solution:

Use Singleton so that all parts of the application use the same Logger instance.

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🌍 Real-World Examples of Singleton

• Logger
• Database connections
• Configuration managers
• Cache systems
• Thread pools

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⚙️ How Singleton Works

A Singleton class follows 3 essential rules:

1. Private Constructor
   Prevents creating objects using new.

2. Private Static Instance Variable
   Holds the single instance of the class.

3. Public Static Access Method
   Returns the same instance every time it is called.

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🧩 Pseudocode for Singleton Logger