Java设计模式详解之门面模式(外观模式)

// 定义了一个统一的入口
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();
}
}
// 直接利用之前定义的外观类来绘制各种形状，至于怎么获得、怎么绘制无需关注
public class FacadePatternDemo {
public static void main(String[] args) {
ShapeMaker shapeMaker = new ShapeMaker();
shapeMaker.drawCircle();
shapeMaker.drawRectangle();
shapeMaker.drawSquare();
}
}

class DrawerOne {
public void open() {
System.out.println("第一个抽屉被打开了");
getKey();
}
public void getKey() {
System.out.println("得到第二个抽屉的钥匙");
}
}
class DrawerTwo {
public void open() {
System.out.println("第二个抽屉被打开了");
getFile();
}
public void getFile() {
System.out.println("得到这个重要文件");
}
}
class DrawerFacade {
DrawerOne darwerOne = new DrawerOne();
DrawerTwo darwerTwo = new DrawerTwo();
public void open() {
darwerOne.open();
darwerTwo.open();
}
}
public class DrawerClient {
public static void main(String[] args) {
DrawerFacade drawer = new DrawerFacade();
drawer.open();
}
}