The Facade Pattern is a design principle that advocates for the provision of a single, streamlined interface to a collection of interfaces within a subsystem. This approach effectively conceals the intricacies of the subsystem from the client.
The Facade Pattern can be defined as an abstraction layer that provides a simplified interface for a complex subsystem.
Essentially, every Abstract Factory can be considered a subtype of Facade.
It protects the clients from the intricacies of the sub-system components.
It facilitates a low level of dependency between subsystems and the entities that use them.
Application of the Facade Pattern:
- When you desire to offer a straightforward interface for an intricate sub-system.
- When there are several dependencies between clients and the implementation classes of an abstraction.
Source code of ShapeFacade.java
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package com.t4b.test.java.dp.sp.fp;
class ShapeFacade {
interface Shape {
void draw();
}
class Rectangle implements Shape {
@Override
public void draw() {
System.out.println("Drawing Rectangle!");
}
}
class Square implements Shape {
@Override
public void draw() {
System.out.println("Drawing Square!");
}
}
class Circle implements Shape {
@Override
public void draw() {
System.out.println("Drawing Circle!");
}
}
private Shape circle = new Circle();
private Shape rectangle = new Rectangle();
private Shape square = new Square();
public ShapeFacade() {
}
public void drawCircle() {
circle.draw();
}
public void drawRectangle() {
rectangle.draw();
}
public void drawSquare() {
square.draw();
}
}
Source code of TestMain.java
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package com.t4b.test.java.dp.sp.fp;
public class TestMain {
public static void main(String[] args) {
ShapeFacade shapeFacade = new ShapeFacade();
shapeFacade.drawCircle();
shapeFacade.drawRectangle();
shapeFacade.drawSquare();
}
}
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