问题解决了！！！！！！非常感谢垃圾神和 HoverCraftFullOfEels！我终于通过使用下面的示例并稍微改变它来了解这个概念。更改允许缩放进度条（默认为 100 个单位）。再次感谢您的耐心和愿意解决这个问题。意味着很多人，~Kyte
ps - +1 全方位 :)
/** @see http://stackoverflow.com/questions/4637215 */
public class Threading_01 extends JFrame {
private static final String s = "0.00";
private JProgressBar progressBar = new JProgressBar(0, 100);
private JLabel label = new JLabel(s, JLabel.CENTER);
public Threading_01() {
this.setLayout(new GridLayout(0, 1));
this.setTitle("√2");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.add(progressBar);
this.add(label);
this.setSize(161, 100);
this.setLocationRelativeTo(null);
this.setVisible(true);
}
public void runCalc() {
// progressBar.setIndeterminate(true);
TwoWorker task = new TwoWorker();
task.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent e) {
if ("progress".equals(e.getPropertyName())) {
progressBar.setIndeterminate(false);
progressBar.setValue((Integer) e.getNewValue());
System.out.println("**: " + e.getNewValue());
}
}
});
task.execute();
}
private class TwoWorker extends SwingWorker<Double, Double> {
private static final int N = 734;
private final DecimalFormat df = new DecimalFormat(s);
@Override
protected Double doInBackground() throws Exception {
int cntr = 1; //
double d1;
double d2;
double d3;
for (int i = 0; i <=N; i++) {
d1 = N;
d2 = i;
d3 = d2/d1;
d3 = d3 * 100;
System.out.println(i + "++ " + d3);
if(d3 >= cntr){
System.out.println(i + "UPDATE");
cntr++;
setProgress(cntr);
publish(Double.valueOf(cntr));
Thread.sleep(250); // simulate latency
}
}
return Double.valueOf(0);
}
@Override
protected void process(List<Double> chunks) {
for (double d : chunks) {
label.setText(df.format(d));
System.out.println(": " + d);
}
}
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
Threading_01 t = new Threading_01();
t.runCalc();
}
});
}
}