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Design Patterns for Software Developers*

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1.Introduction to Design Patterns

Why Design Patterns?The Telescoping Trap Core Design Principle The Three Pillars Creational Patterns Structure vs. Behavior Quick Recall Key Takeaways

2.Creational Patterns

Constructing Complexity The Assembly Line The Telescoping Problem The One and Only Locking the Constructor The Thread Safety Trap Don't Build, Clone Copy Methods Delegating Creation Subclassing the Logic Factories of Factories Factory Method vs. Abstract Factory Creational Patterns Recap

3.Structural Patterns

The Universal Translator How Adapter Works Coding the Adapter The Bridge Pattern Avoiding Class Explosion Adapter vs. Bridge The Composite Pattern Part Equals Whole Recursive Execution The Decorator Pattern Coding Decorators The Facade Pattern One Button to Rule Them All The Flyweight Pattern Intrinsic vs. Extrinsic Visualizing Memory Savings The Proxy Pattern Lazy Loading Example Why Not Subclassing?Structural Patterns Recap

4.Behavioral Patterns I

Behavioral Patterns: The Conductors The Chain of Responsibility Real World: Cockpit Warning Systems The Command Pattern The Magic of Undo Invoker vs. Receiver The Mediator Pattern Analogy: Air Traffic Control The Observer Pattern Push vs. Pull Models Identifying Observers The Iterator Pattern The Interpreter Pattern Decoupling Senders from Receivers Mediator Trade-offs Iterator Pattern Quiz Quick Review

5.Behavioral Patterns II

The Time Machine Object Snapshot Mechanics Why not just make it public?The If-Else Nightmare Changing Identity Logic in the State The Algorithm Skeleton Hooks vs. Fixed Steps Pluggable Strategies State vs. Strategy The Visiting Inspector Visitor Trade-offs Behavioral Pattern Recap

6.Conclusion

Blueprints, Not Just Code Creational: Building Objects Structural: Connecting Parts Behavioral: Managing Flow Recap: Which Pattern When?A Shared Language

Design Patterns for Software Developers*

The Observer Pattern

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