java编程代码!请仔细看我的说明. . .

java编程代码!请仔细看我的说明. . .

我来帮您，代码如下：
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JProgressBar;

public class A extends JFrame {
private static final long serialVersionUID = 1L;
JProgressBar pb;

A() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300, 300);
setLocation(400, 100);
getContentPane().setLayout(null);
pb = new JProgressBar(); // 改动1
pb.setBounds(10, 201, 212, 40);
getContentPane().add(pb);
setTitle("滚动条测试！");
pb.setStringPainted(true);

final JLabel label = new JLabel();
label.setText("正在登陆验证，请稍候。。。");
label.setBounds(10, 179, 212, 18);
getContentPane().add(label);

final JLabel label03 = new JLabel();
label03.setBounds(49, 247, 13, 18);
getContentPane().add(label03);

final JLabel label04 = new JLabel();
label04.setBounds(68, 247, 13, 18);
getContentPane().add(label04);

final JLabel label05 = new JLabel();
label05.setBounds(86, 247, 13, 18);
getContentPane().add(label05);

final JLabel label06 = new JLabel();
label06.setBounds(105, 247, 13, 18);
getContentPane().add(label06);

final JLabel label07 = new JLabel();
label07.setBounds(124, 247, 13, 18);
getContentPane().add(label07);

final JLabel label02 = new JLabel();
label02.setBounds(30, 247, 13, 18);
getContentPane().add(label02);

final JLabel label01 = new JLabel();
label01.setBounds(10, 247, 13, 18);
getContentPane().add(label01);

final JLabel label08 = new JLabel();
label08.setBounds(143, 247, 13, 18);
getContentPane().add(label08);

final JLabel label09 = new JLabel();
label09.setBounds(162, 247, 13, 18);
getContentPane().add(label09);

final JLabel label10 = new JLabel();
label10.setBounds(177, 247, 13, 18);
getContentPane().add(label10);

JButton btn1 = new JButton("登陆");
btn1.addActionListener(new ActionListener() {
private int i;

public synchronized void actionPerformed(final ActionEvent e) {
new Thread() {
public synchronized void run() {
for (i = 0; i <= 100; i++) {
pb.setValue(i);
try {
Thread.currentThread();
Thread.sleep(200);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
switch (i) {
case 0:
label01.setText("*");
break;
case 10:
label01.setText("*");
label02.setText("*");
break;
case 20:
label01.setText("*");
label02.setText("*");
label03.setText("*");
break;
case 30:
label01.setText("*");
label02.setText("*");
label03.setText("*");
label04.setText("*");
break;
case 40:
label01.setText("*");
label02.setText("*");
label03.setText("*");
label04.setText("*");
label05.setText("*");
break;
case 50:
label01.setText("*");
label02.setText("*");
label03.setText("*");
label04.setText("*");
label05.setText("*");
label06.setText("*");
break;
case 60:
label01.setText("*");
label02.setText("*");
label03.setText("*");
label04.setText("*");
label05.setText("*");
label06.setText("*");
label07.setText("*");
break;
case 70:
label01.setText("*");
label02.setText("*");
label03.setText("*");
label04.setText("*");
label05.setText("*");
label06.setText("*");
label07.setText("*");
label08.setText("*");
break;
case 80:
label01.setText("*");
label02.setText("*");
label03.setText("*");
label04.setText("*");
label05.setText("*");
label06.setText("*");
label07.setText("*");
label08.setText("*");
label09.setText("*");
break;
case 90:
label01.setText("*");
label02.setText("*");
label03.setText("*");
label04.setText("*");
label05.setText("*");
label06.setText("*");
label07.setText("*");
label08.setText("*");
label09.setText("*");
label10.setText("*");
break;
case 100:
JOptionPane.showMessageDialog((new A()
.getContentPane()), "登陆成功", "恭喜您！",
JOptionPane.WARNING_MESSAGE);
label01.setText("");
label02.setText("");
label03.setText("");
label04.setText("");
label05.setText("");
label06.setText("");
label07.setText("");
label08.setText("");
label09.setText("");
label10.setText("");
pb.setValue(0);
}

}
}
}.start();
}
});
btn1.setBounds(86, 92, 90, 39);
Container con = getContentPane();
con.add(btn1);

}

public static void main(String[] args) {
new A().setVisible(true);
}
}