定时器处理jFrame并填充进度条

Question

我是初学者，我想在我运行程序时启动计时器（即当父jFrame出现时）并在5秒后丢弃帧。我想在计时器启动时开始填充虚拟进度条，并将其完全填满，直到计时器熄灭。

Answer 1

这是您的代码

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
public class ClosingPanel extends JFrame{
private final Timer every50millis;

public ClosingPanel() {
    setTitle("this panel will self-destruct");
    setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    final JProgressBar progressBar = new JProgressBar(SwingConstants.HORIZONTAL, 0, 100);
    add(progressBar);
    pack();
    every50millis = new Timer(50, new ActionListener() {
        private int count=0;
        @Override
        public void actionPerformed(ActionEvent e) {
            count++;
            progressBar.setValue(count);
            if (count==100) {
                shutdown();
            }
        }
    });
    every50millis.start();
}

private void shutdown() {
    System.err.println("shutting down");
    every50millis.stop();
    WindowEvent closingEvent = new WindowEvent(ClosingPanel.this, WindowEvent.WINDOW_CLOSING);
    Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(closingEvent);
}

public static void main(String[] args) throws Exception {
    SwingUtilities.invokeAndWait(new Runnable() {
        @Override
        public void run() {
            ClosingPanel panel = new ClosingPanel();
            panel.setVisible(true);
        }
    });
}

}