play a .wav files one after another

package com.bornander.soundexample;

import java.io.File;
import java.io.FileFilter;
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 SoundPlayer {

  private static final int BUFFER_SIZE = 1024 * 1024;
  
  public static void playDirectory(final String directory, final FileFilter filter) throws UnsupportedAudioFileException, IOException, LineUnavailableException {
    final File directoryInfo = new File(directory);
    if (directoryInfo.exists() && directoryInfo.isDirectory()) {
      for(File file : directoryInfo.listFiles(filter)) {
        playFile(file);
      }
    }
  }
 
  public static void playFile(final File file) throws UnsupportedAudioFileException, IOException, LineUnavailableException{
    AudioInputStream audioStream = null;
    SourceDataLine sourceLine = null;
    
    try {
      audioStream = AudioSystem.getAudioInputStream(file);
      final AudioFormat audioFormat = audioStream.getFormat();
      final DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
      sourceLine = (SourceDataLine) AudioSystem.getLine(info);
      sourceLine.open(audioFormat);
      sourceLine.start();
  
      int bytesRead = 0;
      final byte[] buffer = new byte[BUFFER_SIZE];
      while ((bytesRead= audioStream.read(buffer, 0, buffer .length)) != -1) {
        if (bytesRead>= 0) {
          sourceLine.write(buffer, 0, bytesRead);
        }
      }
    }
    finally {
      if (audioStream != null)
        audioStream.close();
      
      if (sourceLine != null) {
          sourceLine.drain();
          sourceLine.close();
      }
    }
  }
}

package com.bornander.soundexample;

import java.io.File;
import java.io.FileFilter;

public class Program {
  public static void main(String[] args) throws Exception {
    SoundPlayer.playDirectory("C:\\Users\\Fredrik\\Sounds", new FileFilter() {
      @Override
      public boolean accept(File pathname) {
        return pathname.getName().endsWith(".wav");
      }
    });
  }
}