try {
    Process process = Runtime.getRuntime().exec("cmd /c copy 1.wav+2.wav 3.wav");  //调用Ping命令
    InputStream in1=new FileInputStream("3.wav");     
    AudioStream au =new AudioStream(in2);  
    au.player.start(au);
    //结束后也可以将新的wav删除  
}catch (Exception  e)
    {
      e.printStackTrace();
      }  
      }

------解决方案--------------------
linux下：
Java code
try {
    Process process = Runtime.getRuntime().exec("cp>1.wav+2.wav 3.wav");  //调用cp命令
    InputStream in1=new FileInputStream("3.wav");     
    AudioStream au =new AudioStream(in2);  
    au.player.start(au);
    //结束后也可以将新的wav删除  
}catch (Exception  e)
    {
      e.printStackTrace();
      }  
      }

------解决方案--------------------
import javax.sound.sampled.*;    
  file = new File("XXXX.WAV");
       issoundfirst = true;

     try
     {
       stream = (AudioInputStream)AudioSystem.
         getAudioInputStream(
           file);
       AudioFormat format = stream.getFormat();
       if((format.getEncoding() == AudioFormat.Encoding.ULAW) ||
          (format.getEncoding() == AudioFormat.Encoding.ALAW))
       {
         AudioFormat tmp = new AudioFormat(
           AudioFormat.Encoding.PCM_SIGNED,
           format.getSampleRate(),
           format.getSampleSizeInBits() * 2,
           format.getChannels(),
           format.getFrameSize() * 2,
           format.getFrameRate(),
           true);
         stream = AudioSystem.getAudioInputStream(tmp,stream);
         format = tmp;
       }
       DataLine.Info info = new DataLine.Info(
         Clip.class,
         stream.getFormat(),
         ((int)stream.getFrameLength() *
          format.getFrameSize()));
       clip = (Clip)AudioSystem.getLine(info);
       clip.open(stream);
       clip.start();
       while(clip.isActive())
       {

       }
       clip.stop();
       clip.close();
     }