理解-装饰器模式-设计模式

package com.hk.ztry;

interface Sourcable
{
    public void operation();  

}  

class Source implements Sourcable
{
    public void operation()
    {
        System.out.println("Soure类实现了原始接口Sourcable中的方法");
    }
}

class Decorator1 implements Sourcable
{
    private Sourcable sourcable;
    public Decorator1(Sourcable sourcable)
    {
        super();
        this.sourcable=sourcable;
    }  

    public void operation()
    {
        System.out.println("before第1个装饰器");
        sourcable.operation();
        System.out.println("after第1个装饰器");
    }
}  

class Decorator2 implements Sourcable
{  

    private Sourcable sourcable;
    public Decorator2(Sourcable sourcable)
    {
        super();
        this.sourcable=sourcable;
    }
    public void operation()
    {
         System.out.println("before第2个装饰器");
         sourcable.operation();
         System.out.println("after第2个装饰器");
    }
}  

public class TestDecorator
{
    public static void main(String[] args)
    {
        Sourcable source = new Source();  

        //好神奇啊， 接口=new 实现类();
        //然后接口，体现出实现类的功能，
        //接口=new 装饰类()，
        //然后接口，在原有的实现类中进行了装饰功能
        Sourcable obj = new Decorator1(new Decorator2(source));  

        obj.operation();
    }
}