JProgressBar进度条

核心在于线程操作

//source code

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener ;
class ProcessBar extends Thread  {
    private int DELAY = 100 ;
    private JProgressBar  bar  ;
    private JButton button ;
    private boolean flag = true ;
    public ProcessBar(JProgressBar bar,JButton button)  {
        this.bar = bar ;
        this.button = button ;   
       
    }
   
    public void run()  {
        button.setEnabled(false);
        int max = bar.getMaximum() ;
        while(flag)  {
            try  {
                Thread.sleep(DELAY);   //休眠100毫秒
            } catch(InterruptedException ignoreException)  {
               
            }
            bar.setValue(bar.getValue()+1);
            if(bar.getValue() >= max)  {
                flag = false ;
            }
        } 
        button.setEnabled(true);
    }
} ;

class Tester  {
    public static void main(String args[])  {
        final JProgressBar pbar = new JProgressBar(0,100) ;
        pbar.setStringPainted(true);
        final JButton bstart = new JButton("开始") ;
        bstart.addActionListener(new ActionListener()  {
            public void actionPerformed(ActionEvent e)  {
                if (pbar.getValue() >= pbar.getMaximum())  {
                    pbar.setValue(0) ;
                }
                Thread stepper = new ProcessBar(pbar, bstart) ;
                stepper.start() ;
            }
        });
       
        JFrame frame  = new JFrame("安装进度") ;
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(pbar,BorderLayout.NORTH) ;
        frame.add(bstart,BorderLayout.SOUTH) ;
        frame.setSize(300,100);
        frame.setVisible(true) ;
    }
}