java - 带线程的进度条 (Java Swing)

Question

这是一个小例子:

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        int x = 0;
        while (jProgressBar1.getValue() < 100) {
            try {
                Thread.sleep(50);
                x++;
                jProgressBar1.setValue(x);
                jProgressBar1.repaint();
            } catch (InterruptedException ex) {
                Logger.getLogger(MainWindow.class.getName()).log(Level.SEVERE, null, ex);
            }
            System.out.println(jProgressBar1.getValue());
        }
    }

System.out.println(jProgressBar1.getValue()); 将数字返回到 IDE 输出，但 jProgressBar1 不绘制该值。这段代码有什么问题？请帮忙。

Answer 1

切勿在 Swing 线程中使用 Thread.sleep()。请改用 javax.swing.Timer。

示例:

private void jButton1ActionPerformed(ActionEvent evt) {                                         
    final Timer t = new Timer(50, new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            jProgressBar1.setValue(jProgressBar1.getValue() + 1);
            if (jProgressBar1.getValue() == 100) {
              ((Timer) e.getSource()).stop();
            }
        }
    });
    t.start();
}