Design Patterns Explained | Java, Singleton, Thread Safety & Anti-Pattern

Design patterns are timeless solutions to recurring software problems — and mastering them sharpens how you think about architecture.

In this first episode of the series, we explore what design patterns are, where they came from, and why they still matter today. Then we zoom into one of the most iconic and debated patterns: the Singleton. You’ll learn how Singleton became a go-to in scenarios like logging and configuration, and why it’s often labeled an anti-pattern in modern systems. From thread safety and lazy loading to Java-specific quirks like double-checked locking, we cover the pattern’s strengths, limitations, and real-world trade-offs.

This series is designed for backend engineers, architects, and anyone preparing for interviews or leveling up their system design thinking.

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⏱️ Timestamps
0:00 – Intro: Why We Need Design Patterns
1:00 – What Are Design Patterns? (Gang of Four)
2:34 – Intro to Singleton Pattern
3:00 – Java Singleton Implementation Explained
4:56 – Thread-Safety, Double-Check Locking & Volatile
5:18 – Lazy Initialization & Performance Benefits
5:36 – Why Singleton Is Sometimes Called an Anti-Pattern
6:45 – When to Use It (And When Not To)
7:20 – Outro: Upcoming Patterns + Subscribe
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