可购物的商品和价钱存放在list1.java中，
String[] list1={"001","笔记本","3","0"};
String[] list2={"002","笔记本1","3",...String[] list3={"003","笔记本2","3","0"};
String[] list4={"004","笔记本3","3","0"};
可以修改或增加上面的内容，来改变购物的类别...，和数量，下附程序源代码：
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import...);
JPanel panel_1 = new JPanel();
contentPane.add(panel_1, BorderLayout.SOUTH...panel_2 = new JPanel();
contentPane.add(panel_2, BorderLayout.CENTER);
panel_2.setLayout
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