Re: Help w/ primitive type byte
Bryan wrote:
On Dec 8, 7:29 pm, Arne Vajh?j <a...@vajhoej.dk> wrote:
Bryan wrote:
I was wondering if anyone would be willing to help me understand what
is going on with some code that I came across. It has to do with the
primitive type byte. What it's modeling basically is a register in a
device such as a remote terminal unit (RTU). The register holds a word
(byte[2]). Can someone explain what is going on with the code below?
private byte[] m_Register = new byte[2];
public final synchronized void setValue(int v) {
m_Register[0] = (byte) (0xff & (v >> 8));
m_Register[1] = (byte) (0xff & v);
}
public final int toInteger() {
return ((m_Register[0] & 0xff) << 8 | (m_Register[1] & 0xff));
}Does the code not work as it should ?
Or are you looking for an explanation of the operators used ?
The code works fine. I'm looking for an explanation of how it works.
& is binary and
| is binary or
>> is bit shift down
<< is bit shift up
Try and do the calculations in binary radix on a piece of paper.
It is not that difficult.
Arne
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