Java设计模式 - 外观模式
外观模式隐藏了系统的复杂性。
它为客户端提供了一个简单的接口，客户端使用接口与系统交互。
外观模式是结构型模式。
例子
class ShapeFacade {
interface Shape {
void draw();
}
class Rectangle implements Shape {
@Override
public void draw() {
System.out.println("Rectangle::draw()");
}
}
class Square implements Shape {
@Override
public void draw() {
System.out.println("Square::draw()");
}
}
class Circle implements Shape {
@Override
public void draw() {
System.out.println("Circle::draw()");
}
}
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();
}
}
public class Main {
public static void main(String[] args) {
ShapeFacade shapeFacade = new ShapeFacade();
shapeFacade.drawCircle();
shapeFacade.drawRectangle();
shapeFacade.drawSquare();
}
}
上面的代码生成以下结果。
Circle::draw()
Rectangle::draw()
Square::draw()