create an ArrayList of bytes

Question

I want to read bytes from a wave file into an array. Since the number of bytes read depends upon the size of the wave file, I\'m creating a byte array with a maximum size of

Answer 1

Something like this should do:

List myBytes = new ArrayList();

//assuming your javax.sound.sampled.AudioInputStream is called ais

while(true) {
  Byte b = ais.read();
  if (b != -1) { //read() returns -1 when the end of the stream is reached
    myBytes.add(b);
  } else {
    break;
  }
}

Sorry if the code is a bit wrong. I haven't done Java for a while.

Also, be careful if you do implement it as a while(true) loop :)

Edit: And here's an alternative way of doing it that reads more bytes each time:

int arrayLength = 1024;
List myBytes = new ArrayList();

while(true) {

  Byte[] aBytes = new Byte[arrayLength];
  int length = ais.read(aBytes); //length is the number of bytes read

  if (length == -1) {  //read() returns -1 when the end of the stream is reached
    break; //or return if you implement this as a method
  } else if (length == arrayLength) {  //Array is full
    myBytes.addAll(aBytes);
  } else {  //Array has been filled up to length

    for (int i = 0; i < length; i++) {
      myBytes.add(aBytes[i]);
    }
  }
}

Note that both read() methods throw an IOException - handling this is left as an exercise for the reader!