JAVA如何实现文本框数字滚动

public class MyFrame extends JFrame implements Runnable{
JTextField jt1,jt2,jt3;
JLabel jl1,jl2,jl3;
JButton jb1,jb2;
boolean boo=false;
public MyFrame(){
super("简单的抽奖程序");

jt1=new JTextField(10);
jt2=new JTextField(10);
jt3=new JTextField(10);
jl1=new JLabel("请输入号码区间：");
jl2=new JLabel("到");
jl3=new JLabel(" ");
jb1=new JButton("开始抽奖");
jb2=new JButton("停止");
setLayout(new FlowLayout());
add(jl1);add(jt1);add(jl2);add(jt2);add(jt3);add(jb1);add(jb2);add(jl3);
jb1.addActionListener(new jbAction());
jb2.addActionListener(new jb2Action());
}
class jbAction implements ActionListener{
public void actionPerformed(ActionEvent e) {
boo=true;
new Thread().start();
}
}
class jb2Action implements ActionListener {

        public void actionPerformed(ActionEvent e) {
            boo=false;
            jl3.setText("恭喜"+jt3.getText()+"中奖！");
        }
    }
public static void main(String[] args) {
        MyFrame myFrame=new MyFrame();
        myFrame.setSize(500, 400);
        myFrame.setVisible(true);
}
@Override
public void run() {
    while (boo) {
        String str1=jt1.getText();
        int j1=Integer.parseInt(str1);
        String str2=jt2.getText();
        int j2=Integer.parseInt(str2);
        int s=(int) (j1+(Math.random()*(j2-j1+1)));
        String string=Integer.toString(s);
        jt3.setText(string);            
        try {
            Thread.sleep(200);
            } catch (InterruptedException e) {
            e.printStackTrace();
            }
    }
}
}