From byte to long

Hi
A very easy question. Imagine the byte 0xFF (Or 11111111). I want to build a long (64 bits length) having this byte on the last 8 bits starting from the right. That is:
0000000....0000011111111
If a write long l = (long) b, then l is -1 (Or 111111...11111). Is there any way to do this? Thanks in advance.

byte b = (byte)0xff;
long l = b;
l &= 0xff;This solution works but this is not what I am looking
for. Imagine that you do not know the value of the
byte. This byte is only a variable. And the purpose
is to set this byte at the end of the long bit
String, that is, the first 8 bits starting from the
right. Any ideas?That's exactly what the code does. You should only change the value of b.
Kaj

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