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？