abs.java

来自「java装饰模式。通过装饰完成对上层类的封装。」· Java 代码 · 共 14 行

import java.io.*;
/**
this is the system about sell something
the author is dupeng.
all right reserved
*/
/*
this is the abstract class,he has only two methods.
*/
public abstract class abs
{
	public abstract double getFinalCost();
	public abstract void display();
}