tail.java

java装饰模式。通过装饰完成对上层类的封装。

import java.io.*;
public class tail extends abs
{
	abs theAbs;
	/*the tail to tell the final cost of all the goods you buy*/
	public tail(abs theAbs)
	{
		this.theAbs=theAbs;
	}
	public void display()
	{
		theAbs.display();
		System.out.println("-----------------------------------------------\n");
		System.out.println("Total                         "+theAbs.getFinalCost());
	}
	public double getFinalCost()
	{
		return theAbs.getFinalCost();
	}
}