Hi,

I have written a method which takes a byte array in as an argument, does
some manipulation on that byte array, putting them into a new array and then
returning the byte array.

e.g.

public byte[] changeArray(byte[] mydata)
{
   byte[] returnBytes = new byte[mydata.length];
   // do some stuff etc.
   return returnBytes;
}

That works fine !!   My question is: the java.io.DataInputStream has the
method:  int read(byte[] b) and yet the method puts the bytes into the array
b without actually returning that array.  I've tried implementing it like
this for my above example but when I call my method the array byte b[] is
actually only a copy of the original byte array so is therefore only local
for that method - therefore the original byte array is not changed.  So, how
on earth does the java.io.DataInputstream read(byte b[]) method manage to
change the byte array like this when I have to actually return the byte
array?