设计模式之装饰模式

定义：动态地给一个对象加入一些额外的职责，就添加功能来说，装饰模式比生成子类更为灵活。

结构图：

演示样例代码：

public abstract class Component {

	 public abstract void operation();
}
public class ConcreteComponent extends Component{

	@Override
	public void operation() {
		// TODO Auto-generated method stub
		System.out.println("详细对象操作!");
	}

}
public class ConcreteDecoratorB extends Decorator {
	
	@Override
	public void operation() {
		// TODO Auto-generated method stub
		super.operation();
		System.out.println("详细装饰对象B的操作");
	}

	private void AddedBehavior() {
		System.out.println("我是B操作");
	}
}

public class ConcreteDecoratorA extends Decorator {

	private String addedState;
	
	@Override
	public void operation() {
		// TODO Auto-generated method stub
		super.operation();
		addedState = "New State";
		System.out.println("详细装饰对象A的操作");
	}

}

public class Client {

	public static void main(String[] args) {
		
		ConcreteComponent c = new ConcreteComponent();
		ConcreteDecoratorA d1 = new ConcreteDecoratorA();
		ConcreteDecoratorB d2 = new ConcreteDecoratorB();
		d1.setComponent(c);
		d2.setComponent(d1);
		d2.operation();
//		d1.setComponent(d2);
//		d1.operation();
	}

}

详细对象操作!
详细装饰对象A的操作
详细装饰对象B的操作