怎么在java application中播放声音

public class JavaAudioPlaySoundExample
{
  public static void main(String[] args) 
  throws Exception
  {
    // open the sound file as a Java input stream
    String gongFile = "/Users/al/DevDaily/Projects/MeditationApp/resources/gong.au";
    InputStream in = new FileInputStream(gongFile);

    // create an audiostream from the inputstream
    AudioStream audioStream = new AudioStream(in);

    // play the audio clip with the audioplayer class
    AudioPlayer.player.start(audioStream);
  }
}

package test.buyticket;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.SourceDataLine;

/**
 * @author xujsh(xjs250@163.com)
 *
 */
public class SimplePlayer {
	
	private static ExecutorService playSoundService = Executors.newFixedThreadPool(1);
	
	private SimplePlayer(){
	}
	
	public static void play(String filename){
		if(filename == null 
------解决方案--------------------
 filename.equals("")){
			System.err.println("Wave file can not be empty!"); 
		}
		play(new File(filename));
	}
	
	public static void play(File soundFile){
		try {
			if(soundFile == null 
------解决方案--------------------
 !soundFile.exists()){
				System.err.println("Wave file not found: " + soundFile);
			}
			InputStream soundStream = new FileInputStream(soundFile);
			play(soundStream);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public static void play(InputStream soundStream){
		if (soundStream == null) {
			System.err.println("sound file error!" );
			return;
		}
		PlayTask task = new PlayTask(soundStream);
		playSoundService.execute(task);
	}
	
	public static void destroy(){
		playSoundService.shutdown();
	}
	
	private static class PlayTask implements Runnable{