A Playful Guide to 23 Classic Design Patterns Illustrated with Everyday Scenarios

The author introduces himself as a code‑writing architect and promises to share design‑pattern knowledge through relatable stories.

01 Factory Method : Comparing fast‑food chicken wings to a factory that separates the client from product creation; the client requests a product without knowing its concrete class.

02 Builder Pattern : Describes a multilingual “I love you” device that assembles a phrase in different languages, illustrating how a builder separates object construction from its representation.

03 Abstract Factory : Uses the example of ordering a hamburger at a restaurant, showing how an abstract factory delegates creation to concrete factories for varied products.

04 Prototype Pattern : Talks about copying romantic lines for QQ messages, demonstrating cloning of a prototype to create new objects without subclassing.

05 Singleton Pattern : The narrator claims to be the sole husband of six wives, illustrating that a class should have only one globally accessible instance.

06 Adapter Pattern : A friend named Kent acts as an adapter between the narrator and a Hong‑Kong speaker, converting incompatible interfaces.

07 Bridge Pattern : Shows how different greetings (morning, evening, compliments) can be combined independently of their implementations.

08 Composite Pattern : Describes a birthday‑gift scenario where individual items are treated uniformly as part of a whole.

09 Decorator Pattern : Explains adding layers of decoration (flowers, boxes, cards) to a person, dynamically extending functionality.

10 Facade Pattern : Uses a camera’s auto mode as a façade that hides complex settings behind a simple interface.

11 Flyweight Pattern : Stores frequently used sentences on a phone and reuses them with a name prefix, sharing intrinsic state to save memory.

12 Memento Pattern : Keeps a snapshot of conversations with different people so they can be restored later.

13 Observer Pattern : Describes a mailing list where subscribers automatically receive updates when new information is published.

14 State Pattern : Shows how a person’s behavior changes with her emotional state, modeled as separate state objects.

15 Strategy Pattern : Advises picking different courting strategies (movie, snack, beach) depending on the target, encapsulating algorithms behind a common interface.

16 Template Method Pattern : Lists a fixed sequence of steps for a romantic encounter, with each step customizable by subclasses.

17 Visitor Pattern : Uses flower‑shop and gift‑shop owners as visitors that apply operations based on each person’s characteristics.

18 Mediator Pattern : The narrator mediates money settlement among four friends playing Mahjong, decoupling direct interactions.

19 Memento Pattern (again) : Emphasizes saving conversation history for later retrieval.

20 Observer Pattern (again) : Reiterates the mailing‑list example for receiving updates.

21 Strategy Pattern (again) : Repeats the idea of choosing different courting tactics.

22 Template Method Pattern (again) : Uses a step‑by‑step guide for intimate encounters as a template.

23 Visitor Pattern (again) : Suggests using visitors to select personalized gifts and cards for each person.

The article concludes with promotional calls to join a community, share the content, and access various paid resources (Java source code, ERP systems, OA systems, etc.).