Question

我已经制作了倒计时钟，但是我想让它播放倒计时结束的声音。我的问题是我得到一个NullPointerException，我不知道如何解决它。这是没有导入的代码：

public class ReminderBeep {
Toolkit toolkit;

private String Path_to_sound = "sirenpolice5.wav";
public AudioClip audioclip;

Timer timer;

public ReminderBeep(int seconds) {
    toolkit = Toolkit.getDefaultToolkit();
    timer = new Timer();
    timer.schedule(new RemindTask(), seconds * 1000);
}

class RemindTask extends TimerTask {
    public void run() {
        System.out.println("Time's up!");
        try {
             URL url = this.getClass().getClassLoader().getResource(Path_to_sound);
             AudioInputStream audioIn = AudioSystem.getAudioInputStream(url);

             Clip clip = AudioSystem.getClip();
             clip.open(audioIn);
             clip.start();
            } catch (MalformedURLException murle) {
            System.out.println(murle);
            } catch (LineUnavailableException e) {

                e.printStackTrace();
            } catch (IOException e) {

                e.printStackTrace();
            } catch (UnsupportedAudioFileException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        System.exit(0); 
    }
}

public static void main(String args[]) {
    Scanner scan = new Scanner(System.in);
    System.out.println("Welcome to countdown clock. Please type how many seconds you wanna count down from");
    int sec = scan.nextInt();
    new ReminderBeep(sec);
    System.out.println("Counting");
 }
}

Answer 1

找到了我错过的问题Thread.sleep(clip.getMicrosecondLength() / 1000);

计数完成后播放.wav文件

1 个答案: