java写出进程条代码

package com.ds;

import java.awt.Color;  
import java.awt.Toolkit;  
import javax.swing.ImageIcon;  
import javax.swing.JLabel;  
import javax.swing.JOptionPane;  
import javax.swing.JProgressBar;  
import javax.swing.JWindow;  
  
@SuppressWarnings("serial")  
public class Demo extends JWindow implements Runnable {  
  
    // 定义加载窗口大小  
    public static final int LOAD_WIDTH = 455;  
    public static final int LOAD_HEIGHT = 295;  
    // 获取屏幕窗口大小  
    public static final int WIDTH = Toolkit.getDefaultToolkit().getScreenSize().width;  
    public static final int HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height;  
    // 定义进度条组件  
    public JProgressBar progressbar;  
    // 定义标签组件  
    public JLabel label;  
  
    // 构造函数  
    public Demo() {  
  
        // 创建标签,并在标签上放置一张图片  
        label = new JLabel(new ImageIcon("images/background.jpg"));  
        label.setBounds(0, 0, LOAD_WIDTH, LOAD_HEIGHT - 15);  
        // 创建进度条  
        progressbar = new JProgressBar();  
        // 显示当前进度值信息  
        progressbar.setStringPainted(true);
      //  progressbar.setStringPainted(true);
        // 设置进度条边框不显示  
        progressbar.setBorderPainted(false);  
        // 设置进度条的前景色  
        progressbar.setForeground(new Color(0, 210, 40));  
        // 设置进度条的背景色  
        progressbar.setBackground(new Color(188, 190, 194));  
        progressbar.setBounds(0, LOAD_HEIGHT - 15, LOAD_WIDTH, 15);  
        // 添加组件  
        this.add(label);  
        this.add(progressbar);  
        // 设置布局为空  
        this.setLayout(null);  
        // 设置窗口初始位置  
        this.setLocation((WIDTH - LOAD_WIDTH) / 2, (HEIGHT - LOAD_HEIGHT) / 2);  
        // 设置窗口大小  
        this.setSize(LOAD_WIDTH, LOAD_HEIGHT);  
        // 设置窗口显示  
        this.setVisible(true);  
  
    }  
  
    public static void main(String[] args) {  
        Demo t = new Demo();  
        new Thread(t).start();  
    }  
  
   // @Override  
   public void run() {  
  
        for (int i = 0; i < 100; i++) {  
            try {  
                Thread.sleep(100);  //线程
            } catch (InterruptedException e) {  
                e.printStackTrace();  
            }  
            progressbar.setValue(i);  
        }  
        JOptionPane.showMessageDialog(this, "加载成功");  
        this.dispose();  
  
    }  
  
} 

　　

总结：我还不会呢？