程序员:
 *      T恤/polo+牛仔裤+运动鞋

//程序员
public interface Programmer {
	public void show();
}

//我 shilvfei
public class Shilvfei implements Programmer{

	@Override
	public void show() {
		// TODO Auto-generated method stub
		System.out.println("我是一个程序员");
	}

}

// 这个类就是穿着的抽象类(也就是装饰的抽象类)
public abstract class Decorator implements Programmer{

	protected Programmer programmer;
	
	//给shilvfei穿衣
	public void dress(Programmer programmer){
		this.programmer =  programmer;
	}
	
	@Override
	public void show() {
		// TODO Auto-generated method stub
		if(programmer!=null){
			programmer.show();
		}
	}

}

//T恤
public class Tshirt extends Decorator{

	@Override
	public void show() {
		// TODO Auto-generated method stub
		super.show();
		System.out.println("穿着T恤");
	}
}

//牛仔裤
public class Jeans extends Decorator {

	@Override
	public void show() {
		// TODO Auto-generated method stub
		super.show();
		System.out.println("牛仔裤");
	}
}

//运动鞋
public class GymShoes extends Decorator{

	@Override
	public void show() {
		// TODO Auto-generated method stub
		super.show();
		System.out.println("穿上运动鞋");
	}
}

//开始穿衣
public class DecoratorTest {

	public static void main(String[] args) {
		Programmer shilvfei = new Shilvfei();
		Decorator tShirt = new Tshirt();
		Decorator jeans = new Jeans();
		Decorator gymShoes = new GymShoes();
		
        //首先确定穿在谁身上
		tShirt.dress(shilvfei);
       //穿完T恤的程序员,再穿上牛仔裤
		jeans.dress(tShirt);
        //穿完牛仔裤的程序员,再穿上运动鞋
		gymShoes.dress(jeans);
		
        //show一下
		gymShoes.show();
	}
}

输出结果:

我是一个程序员
穿着T恤
牛仔裤
穿上运动鞋

UML：

装饰模式: 动态地给一个对象添加一些额外的职责，就能增加功能来说，装饰者模式比生成子类更为灵活.