New to Java

Hi All.

I've got an array of bytes (ASCII)
I need to work backwards and remove any spaces from this byte array.
I've tried looping backwards using a for loop, this never gets entered.
I've tried dumping into an arraylist and iterating backwards like so

ArrayList<Byte> listRemove = new ArrayList<Byte>();
for (int i = 0 ; i < bytResponse.length; i++){
	listRemove.add(bytResponse);

}

ListIterator<Byte> listItByte = listRemove.listIterator();

while (listItByte.hasPrevious()) {

	System.out.println(boo);

}
However, even that does not get entered into(the while loop). 

The reason I'm doing is because I have a byte array and I wish to remove any spaces but starting from the back.  
I'm running out of ideas on how I can remove my spaces!  I know the ASCII code for space is 32, but without a means of even looping through the array, I can't even start on how I can do any comparisons without throwing any dereferencing errors.