Java装饰器设计模式初探

interface Component {
  void method();
}
class Coffee implements Component {

  @Override
  public void method() {
    // TODO Auto-generated method stub
    System.out.println("倒入咖啡");
  }
  
}
class Decorator implements Component {
  public Component comp;
  public Decorator(Component comp) {
    this.comp = comp;
  }
  @Override
  public void method() {
    // TODO Auto-generated method stub
    comp.method();
  }
  
}
class ConcreteDecorateA extends Decorator {
  public Component comp;
  public ConcreteDecorateA(Component comp) {
    super(comp);
    this.comp = comp;
  }
  public void method1() {
    System.out.println("倒入牛奶");
  }
  public void method2() {
    System.out.println("加入糖 ");
  }
  public void method() {
    super.method();
    method1();
    method2();
  }
}
class ConcreteDecorateB extends Decorator {
  public Component comp;
  public ConcreteDecorateB(Component comp) {
    super(comp);
    this.comp = comp;
  }
  public void method1() {
    System.out.println("加入巧克力");
  }
  public void method() {
    super.method();
    method1();
  }
}
public class TestDecoratePattern {
  public static void main(String[] args) {
    Component comp = new Coffee();
    comp.method();
    System.out.println("--------------------------------------------------");
    Component comp1 = new ConcreteDecorateA(comp);
    comp1.method();
    System.out.println("--------------------------------------------------");
    Component comp2 = new ConcreteDecorateB(comp1);
    comp2.method();
    System.out.println("--------------------------------------------------");
    Component comp3 = new ConcreteDecorateB(new ConcreteDecorateA(new Coffee()));
    comp3.method();
    System.out.println("--------------------------------------------------");
    Component comp4 = new ConcreteDecorateA(new ConcreteDecorateB(new Coffee()));
    comp4.method();
  }
}