java - 用于处理 jFrame 并填充进度条的计时器

Question

我是初学者，我想在运行程序时启动一个计时器（即当父 jFrame 出现时）并在 5 秒后处理帧。我想在计时器启动时开始填充一个虚拟进度条并完全填充它直到计时器结束。

Answer 1

这是你的代码

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);
        }
    });
}

}