Java实现(11)——外观模式（Facade Pattern)_facade pattern的实现-优快云博客

本文链接：https://blog.youkuaiyun.com/WAN_EXE/article/details/53704789

本文通过实例介绍如何使用外观模式来简化系统中图形绘制部分的调用过程，使其对外提供统一且简单的接口。

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外观模式隐藏系统的复杂性，提供用户统一的接口访问系统。

public interface Shape {
    void draw();
}

public class Circle implements Shape {
    @Override
    public void draw() {
        System.out.println("Circle::draw()");
    }
}

public class Rectangle implements Shape{
    @Override
    public void draw() {
        System.out.println("Rectangle::draw()");
    }
}

public class Square implements Shape {
    @Override
    public void draw() {
        System.out.println("Square::draw()");
    }
}

public class ShapeMaker {
    private Shape circle;
    private Shape rectangle;
    private Shape square;
    public ShapeMaker() {
        circle = new Circle();
        rectangle = new Rectangle();
        square = new Square();
    }
    public void drawCircle() {
        circle.draw();
    }
    public void drawRectangle() {
        rectangle.draw();
    }
    public void drawSquare() {
        square.draw();
    }
}

public class Demo {
    public static void main(String[] args) {
        ShapeMaker shapeMaker = new ShapeMaker();
        shapeMaker.drawCircle();
        shapeMaker.drawRectangle();
        shapeMaker.drawSquare();
    }
}

输出：

Circle::draw()
Rectangle::draw()
Square::draw()