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Decorator Pattern

Decorator Pattern ek structural design pattern hai — Gang of Four (GoF, 1994) ki classic design…

Overview

Decorator Pattern — Quick Facts

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Property: Detail

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Name: Decorator Pattern

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Also Known As: Wrapper Pattern

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Category: Structural Design Pattern

Topic 1

Infobox

📚 | Property | Detail | |---|---| | Name | Decorator Pattern | | Also Known As | Wrapper…

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Problem — Inheritance Explosion

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Base options: Espresso,…

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Add-ons: Milk, Sugar,…

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Inheritance = static, compile-time…

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Combinations = exponential. N…

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Solution — Decorator Pattern

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Wrap, don't inherit. Base object…

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Same interface: Decorator aur…

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Runtime flexibility: Koi bhi…

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Sirf 1 Espresso class + 1 class…

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How Decorator Pattern Works

⭐ Core Structure — 4 Roles | Role | Kya Hai | Kya Karta Hai | |---|---|---| | Component…

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Mermaid Diagram — Class Structure

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Component interface sabko connect…

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Decorator abstract class Component…

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ConcreteDecorators (Milk, Sugar,…

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Mermaid Diagram — Runtime Wrapping Flow

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Client sirf outermost decorator ko…

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Har decorator apna kaam karta hai…

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Sab kuch same interface ke through…

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Final result: base cost + all…

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Real-Life Analogies

🌟 | Analogy | Base Object | Decorators (Wrappers) | Result | |---|---|---|---| | Coffee…

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Decorator vs Inheritance

🚀 | Aspect | Decorator Pattern | Inheritance | |---|---|---| | Timing | Runtime (dynamic) |…

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Decorator vs Related Patterns

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Decorator vs Proxy: Dono same…

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Decorator vs Adapter: Dono wrap…

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Decorator vs Strategy: Strategy…

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Common Use Cases

💡 | Use Case | Base Component | Decorators | Benefit | |---|---|---|---| | Java I/O Streams…

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When to Use / When NOT to Use

🎯 When to Use 1. Dynamic feature combinations chahiye — runtime par decide karna hai ke…

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Common Mistakes

⭐ | Mistake | Problem | Solution | |---|---|---| | Too many layers | 8-10 decorators deep —…

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Best Practices

🔑 1. Single Responsibility per Decorator. Ek decorator = ek concern. LoggingDecorator sirf…

Comparison

Decorator vs Inheritance

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Timing: Runtime (dynamic)

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Flexibility: Any combination, any…

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Class Count: Base + N decorators = N+1…

Comparison

Decorator vs Related Patterns

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Decorator: Object me behavior add karna

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Adapter: Incompatible interface ko…

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Proxy: Object ke access ko control karna

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Decorator Pattern ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Decorator Pattern ka 'Name' kya hai?

Complete! 🎉

Decorator Pattern Complete!

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