谁帮我修改下加粗那句话让程序没有错误

package com.test.audio;

import java.io.File;

import java.awt.BorderLayout;

import java.awt.FileDialog;

import java.awt.Frame;

import java.awt.GridLayout;

import java.awt.Label;

import java.awt.List;

import java.awt.Menu;

import java.awt.MenuBar;

import java.awt.MenuItem;

import java.awt.MenuShortcut;

import java.awt.Panel;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.sound.sampled.AudioFormat;

import javax.sound.sampled.AudioInputStream;

import javax.sound.sampled.AudioSystem;

import javax.sound.sampled.DataLine;

import javax.sound.sampled.SourceDataLine;

public class MusicPlayer extends Frame {

boolean isStop = true; //控制播放线程

boolean hasStop = true; //播放线程状态

String filepath; //播放文件目录

String filename; //播放文件名称

AudioInputStream audioInputStream; //文件流

AudioFormat audioFormat; //文件格式

SourceDataLine sourceDataLine; //输出设备

List list;//文件列表

Label labelfilepath; //播放目录显示标签

Label labelfilename; //播放文件显示标签

public MusicPlayer() {

//设置窗体属性

setLayout(new BorderLayout());

setTitle("MP3音乐播放器");

setSize(350, 370);

//建立菜单栏

MenuBar menubar = new MenuBar();

Menu menufile = new Menu("文件");

MenuItem menuopen = new MenuItem("打开", new MenuShortcut(KeyEvent.VK_O));

menufile.add(menuopen);

menufile.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

open();

}

});

menubar.add(menufile);

setMenuBar(menubar);

//文件列表

list = new List(10);

list.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

//双击时处理

if (e.getClickCount() == 2) {

//播放选中的文件

filename = list.getSelectedItem();

play();

}

}

});

add(list, "Center");

//信息显示

Panel panel = new Panel(new GridLayout(2, 1));

labelfilepath = new Label("播放目录：");

labelfilename = new Label("播放文件：");

panel.add(labelfilepath);

panel.add(labelfilename);

add(panel, "North");

//注册窗体关闭事件

addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

setVisible(true);

}

//打开

private void open() {

FileDialog dialog = new FileDialog(this, "Open", 0);

dialog.setVisible(true);

filepath = dialog.getDirectory();

if (filepath != null) {

labelfilepath.setText("播放目录：" + filepath);

//显示文件列表

list.removeAll();

File filedir = new File(filepath);

File[] filelist = filedir.listFiles();

for (File file : filelist) {

String filename = file.getName().toLowerCase();

if (filename.endsWith(".mp3") || filename.endsWith(".wav")) {

list.add(filename);

}

}

}

}

//播放

private void play() {

try {

isStop = true;//停止播放线程

//等待播放线程停止

System.out.print("开始播放：" + filename);

while (!hasStop) {

System.out.print(".");

try {

Thread.sleep(10);

} catch (Exception e) {

}

}

System.out.println("");

File file = new File(filepath + filename);

labelfilename.setText("播放文件：" + filename);

//取得文件输入流

audioInputStream = AudioSystem.getAudioInputStream(file);

audioFormat = audioInputStream.getFormat();

//转换MP3文件编码

if (audioFormat.getEncoding() != AudioFormat.Encoding.PCM_SIGNED) {

audioFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,

audioFormat.getSampleRate(), 16, audioFormat

.getChannels(), audioFormat.getChannels() * 2,

audioFormat.getSampleRate(), false);

audioInputStream = AudioSystem.getAudioInputStream(audioFormat,

audioInputStream);

}

//打开输出设备

DataLine.Info dataLineInfo = new DataLine.Info(

SourceDataLine.class, audioFormat,

AudioSystem.NOT_SPECIFIED);

sourceDataLine = (SourceDataLine) AudioSystem.getLine(dataLineInfo);

sourceDataLine.open(audioFormat);

sourceDataLine.start();

//创建独立线程进行播放

isStop = false;

Thread playThread = new Thread(new PlayThread());

playThread.start();

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String args[]) {

new MusicPlayer();

}

class PlayThread extends Thread {

byte tempBuffer[] = new byte[320];

public void run() {

try {

int cnt;

hasStop = false;

//读取数据到缓存数据

while ((cnt = audioInputStream.read(tempBuffer, 0,

tempBuffer.length)) != -1) {

if (isStop)

break;

if (cnt > 0) {

//写入缓存数据

sourceDataLine.write(tempBuffer, 0, cnt);

}

}

//Block等待临时数据被输出为空

sourceDataLine.drain();

sourceDataLine.close();

hasStop = true;

} catch (Exception e) {

e.printStackTrace();

System.exit(0);

}

}

}

}

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