装饰设计模式

优点
与继承相比,偶合性不强

例子
BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream("UTF-8.txt"),"UTF-8"));

BufferedReader 对 InputStreamReader进行装饰

----------------------------------
//BB 包装 AA
interface Fangfa{
	void fangfa();
}
class AA implements Fangfa{
	@Override
	public void fangfa(){
		System.out.println("javase");
	}
}

class BB implements Fangfa{
	private AA a;
	public BB(AA a){
		this.a=a;
	}
	@Override
	public void fangfa(){
		a.fangfa();
		System.out.println("javaee");
		System.out.println("Android");
	}
}