倒数计时器窗口关闭

Question

如何在完成30秒的持续时间内通过代码关闭计时器窗口。

这是我的代码

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.SimpleDateFormat;
import java.util.Date;

class CountdownTimer extends JFrame {

    private static final long serialVersionUID = -3613327984360590187L;

    public CountdownTimer() {

        setTitle("Countdown Timer");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final long MINUTES = 30000;
        final SimpleDateFormat sdf = new SimpleDateFormat("mm : ss");
        final JLabel clock = new JLabel(sdf.format(new Date(MINUTES)), JLabel.CENTER);
        JLabel text = new JLabel("Time Remaining: ");
        int x = 0;
        ActionListener actionListener = new ActionListener() {
            long x = MINUTES - 1000;

            public void actionPerformed(ActionEvent ae) {
                clock.setText(sdf.format(new Date(x)));
                x -= 1000;
            }
        };
        new javax.swing.Timer(1000, actionListener).start();

        JPanel jPanel = new JPanel();
        jPanel.add(text);
        jPanel.add(clock);
        getContentPane().add(jPanel);
        pack();

    }

    public static void main(String args[]) {

        new CountdownTimer().setVisible(true);

    }
}

如何在完成30秒的持续时间内通过代码关闭计时器窗口。

这是我的代码

Answer 1

this.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));

Answer 2

试试这个：

public void actionPerformed(ActionEvent ae) {
    clock.setText(sdf.format(new Date(x)));
    x -= 1000;
    if (x < 0) // Add this line
        CountdownTimer.this.dispose(); // And this one too
}