进度条使用方式

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

public class cc extends JFrame implements Runnable{

private JProgressBar probar = null;
private int ix=0;   //初始值
private int speed=50; //调整速度
private int timer=300; //调整时间  1000==1毫秒
public cc() {
init();
Thread tt=new Thread(this);
tt.start();
this.add(probar);
this.setSize(300, 70);
this.setLocation(400, 300);
this.setVisible(true);
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private void init() {
probar = new JProgressBar(ix, 100);
probar.setStringPainted(true);
}
public static void main(String[] args) {
new cc();
}
public void run() {
while(true){