Java swing音频播放问题

求教各位大神，想要实现音频播放功能，具体是打开文件选择器选择音频文件并显示文件路径在文本框中，
然后点击播放开始播放该音频，点击暂停能使音频暂停播放。新手，急求！最好能详细些

package com.musicplayer.bean;

import java.io.File;
import java.io.IOException;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.UnsupportedAudioFileException;

public class Player extends Thread{

/**
 * 播放标志
 */
private boolean flag = false;
private boolean pause = false; //暂停标志
private boolean threadflag = false; //该线程是否启动
private AudioInputStream audioInputStream;// 文件流
private AudioFormat audioFormat;// 文件格式
private SourceDataLine sourceDataLine;// 输出设备
Object lock = new Object();//一个空的对象,没什么意义
private File musicfile;

public Player() {

}

public Player(File musicfile) {
    this.musicfile = musicfile;
}

public boolean existFile(){
    return musicfile != null ? true : false;
}

public void loadMusicFile(){
    // 取得文件输入流
    try {
        audioInputStream = AudioSystem.getAudioInputStream(musicfile);
        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);

    } catch (UnsupportedAudioFileException e1) {
        e1.printStackTrace();
    } catch (IOException e1) {
        e1.printStackTrace();
    } catch (LineUnavailableException e1) {
        e1.printStackTrace();
    }
}

public void startplay(){
    if(pause){
        synchronized(lock) {
            pause = false;
            lock.notifyAll();
        }
    }
    flag = true;
}

public void pauseplay(){
    pause = true;
}

public void stopplay(){
    flag = false;
}

@Override
public void run() {
    loadMusicFile();
    threadflag = true;
    byte[] data = new byte[4096];
    int nBytesRead;
    if(sourceDataLine != null){
        synchronized (lock) {
            try {
                while ((nBytesRead = audioInputStream.read(data, 0, data.length)) != -1) {
                    while(pause){
                        if(sourceDataLine.isRunning()) {
                            sourceDataLine.stop();
                            //System.out.println("暂停");
                        }
                        try {
                            lock.wait();
                            //System.out.println("等待");
                        }catch(InterruptedException e) {

                        }
                    }

                    if(flag){
                        sourceDataLine.start();
                    }else{
                        sourceDataLine.drain();
                        sourceDataLine.stop();
                        sourceDataLine.close();
                    }
                    sourceDataLine.write(data, 0, nBytesRead);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

public boolean isStart(){
    return threadflag;
}

public File getMusicfile() {
    return musicfile;
}

public void setMusicfile(File musicfile) {
    this.musicfile = musicfile;
}

}

Player musicplayer = new Player(file); //file为mp3文件
//播放
musicplayer.startplay();
if (!musicplayer.isStart() && musicplayer.existFile()) {
musicplayer.start();
}
//暂停
musicplayer.pauseplay();
下图为我做的播放器demo，有点粗糙

thank you 大神啦！对于小白来说还是很有用的