java+mysql 小型超市系统源码

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class sale2  extends JFrame implements ActionListener  //销售界面
{
    private JPanel sM=new JPanel(); //supermarket面板
JLabel label1,label2;
JTextField field1,field2;
JButton button1,button2;
String num=null,name=null,time=null,add=null,t1=null,t2=null,t3=null;
int price=0,countBG,n1;// 价格/商品的卖出数量
    private JTextArea goodsShow=new JTextArea(); //文本区
    private JScrollPane jsp=new JScrollPane(goodsShow);    //滚动区域 设定内容为 商品显示的文本区

private JButton[] pS={new JButton("销售界面"),
  new JButton("销售管理"),
                  new JButton("商品管理"),
  new JButton("用户管理")}; //personty 按钮
private JLabel[] CD={new JLabel("清单号",JLabel.CENTER),
                 new JLabel("编号",JLabel.CENTER),
 new JLabel("名称",JLabel.CENTER),
 new JLabel("价格",JLabel.CENTER),
 new JLabel("生产日期",JLabel.CENTER),
 new JLabel("产地",JLabel.CENTER),
 new JLabel("数量",JLabel.CENTER)}; //帐单查询时的商品显示标签
    public sale2()
{

label1=new JLabel("按编号查询",JLabel.CENTER);

label2=new JLabel("按帐单查询",JLabel.CENTER);

field1=new JTextField(30);
field2=new JTextField(30);

button1=new JButton("查询1");
button2=new JButton("查询2");
sM.setLayout(null);
field1.setBounds(100,120,150,22);
field2.setBounds(600,120,150,22);
label1.setBounds(100,90,150,30);
label2.setBounds(600,90,150,30);
button1.setBounds(260,120,80,22);
button2.setBounds(760,120,80,22);
        button1.addActionListener(this);
button2.addActionListener(this);
sM.add(label1);
sM.add(label2);
sM.add(field1);
sM.add(field2);
sM.add(button1);
sM.add(button2);

for(int i=0;i<4;i++)
{
pS[i].setBounds(550+i*110,50,100,22);
sM.add(pS[i]);
pS[i].addActionListener(this);
}