Java - Convert int to Byte Array of 4 Bytes? [duplicate]

Question

Possible Duplicate:
Convert integer into byte array (Java)

I need to store the length of a buffer, in a byte array 4 bytes large.

Pseudo code:

private byte[] convertLengthToByte(byte[] myBuffer) {     int length = myBuffer.length;      byte[] byteLength = new byte[4];      //here is where I need to convert the int length to a byte array     byteLength = length.toByteArray;      return byteLength; } 

What would be the best way of accomplishing this? Keeping in mind I must convert that byte array back to an integer later.

Answer 1

You can convert yourInt to bytes by using a ByteBuffer like this:

return ByteBuffer.allocate(4).putInt(yourInt).array(); 

Beware that you might have to think about the byte order when doing so.