Façade Pattern

in Design Patterns
Façade Pattern

Façade Pattern에 대해 설명하는 페이지입니다.

Environment

  • Programming Language: Java

Index

Introduction

  • Purpose
    • Supplies a single interface to a set of interfaces within a system.
  • Use When
    • A simple interface is needed to provide access to a complex system.
    • There are many dependencies between system implementations and clients.
    • Systems and subsystems should be layered.
  • Characteristics
    • Provide a unified interface to a set of interfaces in a subsystem. It defines a higher-level interface that makes a subsystem easier to use.
    • Does not prevent sophisticated clients from accessing the underlying classes.
    • It doesn’t add any functionality. It just simplifies interfaces.
  • Benefits
    • Hides the implementations of the subsystem from clients.
      • makes the subsystem easier to use
    • Promotes weak coupling between the subsystem and its clients
      • allows changing the classes comprising the subsystem without affecting the clients

How to Use (Example)

  • A set of interfaces
    public class Class1 {
    public void doSomething() {
        System.out.print("Hello, ");
    }
}
public class Class2 {
    public void doSomething() {
        System.out.print("World!");
    }
}
  • Façade
    public class MyClass {
    public void doSomething() {
        Class1 c1 = new Class1();
        Class2 c2 = new Class2();
        c1.doSomething();
        c2.doSomething();
    }
}




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