java swing 制作進度條-- 模擬卸載，附效果圖

    利用timer和progressbar外加兩個按鈕制作的小程序，點擊start按鈕開始卸載，點擊stop停止。

代碼如下：

-----------------------------------------------以下是代碼區--------------------------------------------------------------------------

import java.awt.BorderLayout;
import java.awt.Dimension;
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.JPanel;
import javax.swing.JProgressBar;
import javax.swing.Timer;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class ProgressBar extends JFrame implements ChangeListener, ActionListener {

JButton start, stop;
JProgressBar bar;
JLabel show;
JPanel pane, pane1;
Timer timer;

public ProgressBar(String title) {
super(title);
init();
pack();
}

public void init() {
setBounds(300, 100, 300, 100);
pane = new JPanel();
pane.setLayout(new BorderLayout());
getContentPane().add(pane);

start = new JButton("start");
start.addActionListener(this);
stop = new JButton("stop");
stop.addActionListener(this);
pane1 = new JPanel();
pane1.add(start);
pane1.add(stop);

bar = new JProgressBar();
bar.setMinimum(0);
bar.setMaximum(100);
bar.setValue(100);
bar.setStringPainted(true);
bar.addChangeListener(this);
bar.setPreferredSize(new Dimension(200, 30));
int leave = 100 - bar.getValue();
show = new JLabel("已完成：" + leave, JLabel.CENTER);

pane.add(pane1, BorderLayout.NORTH);
pane.add(bar, BorderLayout.CENTER);
pane.add(show, BorderLayout.SOUTH);

timer = new Timer(50, this);
}


@Override
public void stateChanged(ChangeEvent e) {
// TODO Auto-generated method stub
int value = bar.getValue();
int leave = 100-value;
if(e.getSource() == bar) {
show.setText("已完成："+ leave +"%");
}
}


@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource() == start) {
timer.start();
} else if(e.getSource() == stop) {
timer.stop();
bar.setValue(0);
} else if(e.getSource() == timer) {
int value = bar.getValue();
if(value > 0) {
value--;
bar.setValue(value);
}
}
}

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

}

----------------------------- 以上是代碼區 --------------------------------------------------

運行效果如下：

     ---------》  ------------》

注：本代碼可以直接copy運行

轉自：http://blog.csdn.net/lucherr/article/details/7430987