Java：剪辑有时不会播放

Question

每次用户按下或按下时，我在菜单屏幕上播放Clip。我通过每次将剪辑设置为开头摆脱了唯一的播放问题，但有时（我没有看到模式），剪辑将无法播放。我该如何解决这个问题？

package com.cgp.pong;

import java.awt.Color;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JPanel;
import javax.swing.KeyStroke;

public class Menu extends JPanel implements Runnable {
    private static final long serialVersionUID = 1L;
    private Thread thread;
    private File pongf = new File("pong.png");
    private BufferedImage pong, titlecontrols, single, two, controls, singley, twoy, controlsy;
    private File titlecontrolsf = new File("titlecontrols.png");
    private File singlef = new File("single.png");
    private File twof = new File("two.png");
    private File controlsf = new File("controls.png");
    private File singleyf = new File("singley.png");
    private File twoyf = new File("twoy.png");
    private File controlsyf = new File("controlsy.png");
    private boolean[] selected = { true, false, false };
    private int selectedint = 0;
    private Clip clip;
    private AudioInputStream streamwall;

    public Menu() {
        super();
    }

    public void run() {
        images();
        bind();
        sound();
        BufferedImage cursorImg = new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB);
        Cursor blankCursor = Toolkit.getDefaultToolkit().createCustomCursor(cursorImg, new Point(0, 0), "blank cursor");
        setCursor(blankCursor);
        while (true) {
            repaint();
        }
    }

    private void sound() {
        File wall = new File("wall.wav");
        try {
            streamwall = AudioSystem.getAudioInputStream(wall);
        } catch (UnsupportedAudioFileException e2) {
            e2.printStackTrace();
        } catch (IOException e2) {
            e2.printStackTrace();
        }

        DataLine.Info info = new DataLine.Info(Clip.class, streamwall.getFormat());
        try {
            clip = (Clip) AudioSystem.getLine(info);
        } catch (LineUnavailableException e1) {
            e1.printStackTrace();
        }
        try {
            clip.open(streamwall);
        } catch (LineUnavailableException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void bind() {
        InputMap im = getInputMap();
        ActionMap am = getActionMap();
        requestFocus();
        setInputMap(WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, getInputMap());
        im.put(KeyStroke.getKeyStroke("DOWN"), "down");
        am.put("down", new AbstractAction() {
            private static final long serialVersionUID = 1L;

            public void actionPerformed(ActionEvent arg0) {
                clip.start();
                clip.setMicrosecondPosition(0);
                selected[selectedint] = false;
                selectedint++;
                if (selectedint > 2)
                    selectedint = 0;
                selected[selectedint] = true;
            }
        });
        im.put(KeyStroke.getKeyStroke("UP"), "up");
        am.put("up", new AbstractAction() {
            private static final long serialVersionUID = 1L;

            public void actionPerformed(ActionEvent arg0) {
                selected[selectedint] = false;
                selectedint--;
                if (selectedint < 0)
                    selectedint = 2;
                selected[selectedint] = true;
            }
        });
        im.put(KeyStroke.getKeyStroke("SPACE"), "select");
        am.put("select", new AbstractAction() {
            private static final long serialVersionUID = 1L;

            public void actionPerformed(ActionEvent arg0) {
                Pong.startGame();
            }
        });
    }

    private void images() {
        try {
            pong = ImageIO.read(pongf);
            titlecontrols = ImageIO.read(titlecontrolsf);
            single = ImageIO.read(singlef);
            two = ImageIO.read(twof);
            controls = ImageIO.read(controlsf);
            singley = ImageIO.read(singleyf);
            twoy = ImageIO.read(twoyf);
            controlsy = ImageIO.read(controlsyf);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void addNotify() {
        super.addNotify();
        thread = new Thread(this);
        thread.start();
    }

    public void paint(Graphics g) {
        super.paint(g);
        setBackground(Color.BLACK);
        g.setColor(Color.WHITE);
        g.drawImage(pong, 150, 0, null);
        g.drawImage(titlecontrols, 80, 150, null);
        if (selected[0]) {
            g.drawImage(singley, 140, 250, null);
        } else if (!selected[0]) {
            g.drawImage(single, 140, 250, null);
        }
        if (selected[1]) {
            g.drawImage(twoy, 140, 330, null);
        } else if (!selected[1]) {
            g.drawImage(two, 140, 330, null);
        }
        if (selected[2]) {
            g.drawImage(controlsy, 140, 410, null);
        } else if (!selected[2]) {
            g.drawImage(controls, 140, 410, null);
        }
    }
}

提前致谢！