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On Thu, 1 Jun 2000, M. Greenblatt wrote:
>
> In the readWord() method of class Ajpv12InputStream.java we have the
> following bitwise operation:
>
> return ((int)((b1 << 8) | b2)) & 0xffff;
>
> Does anyone happen to know the utility of the '& 0xffff' in this? From
> what I can see it has no effect whatsoever on the final result.
>
> Let me give an example for those of us who dont enjoy bit logic.
>
> Assume:
> b1 = 0000000010101010
> b2 = 0000000011001100
>
> (b1 << 8) = 1010101000000000 | b2
> = 1010101011001100 & 0xffff
> = 1010101011001100
>
> Just wondering if I'm missing something here...
You are supposing that the Java integers are 16 bit long, and I think they
actually are 32 bit integers, so the & 0xffff operation will put 0s in
the higher 16 bits.
I have no idea what it is doing this here, but it certainly *is* having an
effect.
Cheers,
Arkaitz.
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