设计模式之装饰(decorator)

//与composite一样都采用递归组合实现
public class Decorator {
	// 抽象父类
	abstract class Ingredient {
		public abstract void getDescription();
	}

	// 面包
	class Bread extends Ingredient {
		String desc;

		public Bread(String desc) {
			this.desc = desc;
		}

		@Override
		public void getDescription() {
			System.out.println(desc);
		}
	}
	//抽象装饰类
	//BreadDecorator与Ingredient即泛化又组合
	abstract class BreadDecorator extends Ingredient {
		Ingredient ingredient;

		public BreadDecorator(Ingredient ingredient) {
			this.ingredient = ingredient;
		}
	}
	//夹肉
	class Pork extends BreadDecorator {

		public Pork(Ingredient ingredient) {
			super(ingredient);
		}
		@Override
		public void getDescription() {
			ingredient.getDescription();
			System.out.println("pork decorate...");
		}
	}
	//夹蔬菜
	class Vegetable extends BreadDecorator {
		public Vegetable(Ingredient ingredient) {
			super(ingredient);
		}

		@Override
		public void getDescription() {
			ingredient.getDescription();
			System.out.println("vegetable decorate...");
		}
	}
	public static void main(String[] args){
		Decorator decorator = new Decorator();
		Ingredient ingredient = decorator.new Pork(decorator.new Bread("pork bread..."));
		ingredient.getDescription();
		
		Ingredient ingredient2 = decorator.new Vegetable(decorator.new Pork(decorator.new Bread("vegetable pork bread...")));
		ingredient2.getDescription();
	}
}
//http://miaoxiaodong78.blog.163.com/blog/static/18765136200701232434996/