该程序实现的是用空格键控制五个人编号的滚动(用Timer实现)，当选定一个人的时候，显示其名字，具体界面如下：

此程序需要链接数据库，在此用的是Access数据库，数据链接的代码如下：

import java.sql.*;

public class DSconn {

private static final String DB_DRIVER =

"sun.jdbc.odbc.JdbcOdbcDriver";

// DSAccess为数据源名称; DBQ=数据库文件的绝对路径

private static final String DB_URL =

"jdbc:odbc:DSAccess;DBQ=D:\\db1.mdb";

static{

try{

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

}

catch(ClassNotFoundException e)

{ e.printStackTrace(); }

}

public static Connection getConnection() throws

SQLException {

Connection conn =

DriverManager.getConnection(DB_URL);

return conn;

}

public static void main(String[] args) {

try {

Connection

conn =getConnection();

PreparedStatement

pstmt = conn.prepareStatement("select * from t_Student where

ID='1'");

ResultSet rs

= pstmt.executeQuery();

while(rs.next())

{

System.out.println(rs.getString("name"));

}

} catch (SQLException e)

{

e.printStackTrace();

}

}

}

实现该程序的主代码如下：

import java.awt.*;

import java.awt.event.*;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.Random;

import java.util.Timer;

class Winclose extends WindowAdapter

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

//主界面类

public class SelectFrame extends Frame implements

ActionListener //按钮的监听器接口在这里声明实现

{

int s=0;

private static TextField text_id,

text_name;

Button ok,cancel;

Timer timer=new Timer();

public SelectFrame()

{

super("随机抽取");

this.setBounds(280,120,200,240);

this.setBackground(Color.lightGray);

this.setLayout(new FlowLayout(1));

this.add(new Label("编号"));

text_id=new TextField("",12);

this.add(text_id);

text_id.setEnabled(false);

text_name=new TextField("",18);

this.add(text_name);

text_name.setEnabled(false);

ok=new Button("确定");

this.add(ok);

ok.addActionListener(this);

//在命令按钮上注册被实现的监听 cancel= new

Button("取消"); this.add(cancel);

cancel.addActionListener(this); //在命令按钮上注册被实现的监听

this.setVisible(true);

this.addWindowListener(new

Winclose()); //在窗体上注册被实现的时间监听适配器类 }

public void actionPerformed(ActionEvent t) //实现按钮ActionListener监听器的唯一抽象方法，定义按钮单击时的行为

{ if(t.getSource()==ok)

//区分在哪个按钮上发生的ActionEvent事件

{

s+=1;

if(s%2==1)

timer.schedule(new MyTask(), 0500, 1000);

else

{

timer.cancel();

String

ID=text_id.getText();

try {

Connection

conn

=DSconn.getConnection(); //此处调用DSconn类中的数据链接方法 PreparedStatement

pstmt = conn.prepareStatement("select * from t_Student where

ID='"+ID+"'");

ResultSet

rs = pstmt.executeQuery();

while(rs.next())

{

//System.out.println(rs.getString("name"));;

text_name.setText(rs.getString("name"));

}

} catch

(SQLException e) {

e.printStackTrace();

}

}

}

else

{

System.exit(0);

}

}

static class MyTask extends java.util.TimerTask{

@Override

public void

run() {

// TODO Auto-generated method stub

Random rd = new Random();

int index = rd.nextInt(5);

String ind=Integer.toHexString(index+1);

text_id.setText(ind);

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new SelectFrame();

}

}