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Facade Pattern

What is the Facade Pattern?

The Facade Pattern is a structural design pattern that provides a simplified interface to a complex subsystem. It defines a higher-level interface that makes the subsystem easier to use.

Implementation in This Project

This example demonstrates the Facade pattern by providing a ComputerFacade to start a computer, hiding the complexity of the underlying subsystems:

  • ComputerFacade: Facade class that provides a simple interface.
  • CPU, Memory, HardDrive: Subsystem classes.

Class Diagram

flowchart TD
    A["App.java"] --> B["ComputerFacade"]
    B --> C["CPU"]
    B --> D["Memory"]
    B --> E["HardDrive"]
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Example Usage

ComputerFacade computer = new ComputerFacade();
computer.start();

When to Use

  • When you want to provide a simple interface to a complex subsystem.
  • When there are many dependencies between clients and the implementation classes of an abstraction.