adapter

Adapter Pattern

The Adapter Pattern is a structural design pattern that allows objects with incompatible interfaces to work together. It acts as a bridge between two incompatible interfaces.

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📖 What is the Adapter Pattern?

The Adapter Pattern converts the interface of a class into another interface that the client expects. It allows classes with incompatible interfaces to work together without changing their existing code.

Key features:

1. Compatibility: Enables objects with incompatible interfaces to interact.
2. Reusability: Reuses existing code without modification.
3. Flexibility: Adapts interfaces dynamically at runtime.

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🤔 Why Use the Adapter Pattern?

1. Legacy Code: Integrate legacy components with new systems.
2. Third-Party Libraries: Adapt third-party libraries to fit your application's needs.
3. Interface Mismatch: Resolve incompatibilities between interfaces.

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🔧 Implementation

The implementation of the Adapter Pattern can be found in:

• RoundHole.java: Represents the round hole (Client).
• RoundPeg.java: Represents a round peg (Target).
• SquarePeg.java: Represents a square peg (incompatible Adaptee).
• SquarePegAdapter.java: Adapter to make a square peg fit into a round hole.
• Main.java: Demonstrates the usage of the Adapter Pattern.

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🛠️ Example Usage

To see the Adapter Pattern in action, refer to the Main.java file. It demonstrates how to use the adapter to fit a square peg into a round hole.

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📊 UML Diagram

classDiagram
direction LR
    class Client {
        +request()
    }

    class Target {
        +request()
    }

    class Adapter {
        +request()
    }

    class Adaptee {
        +specificRequest()
    }

    Client --> Target
    Target <|-- Adapter
    Adapter --> Adaptee : adaptee

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Note

If the UML above is not rendering correctly, you can view the diagram from the adapter_uml.png file.

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📝 Key Takeaways

• The Adapter Pattern is ideal for bridging incompatible interfaces.
• It enables flexibility and code reuse without modifying existing code.
• Use it when you need to integrate systems with incompatible interfaces.

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