Using && in J2ME...

[kurteknikk]

Hi,

I'm totally mixed up because according to my knowledge when you use '&&' in a condition like:

                while ((inputStream.available() > 0) && (bufferUsed = inputStream.read(buffer)) > 0){

It should check if the first one is true, if not it won't even check the second condition. Right ?

[grahamhughes]

That's right. "&&" and "||" both perform short-circuit evaluation. For "&&", the second expression is only evaluated if the first is true. For "||", the second is only evaluated if the first is false.

Graham.

[kurteknikk]

That's strange because i had a code like that and the very same code with two if statements and the first one was failing on Nokia 6120classic for some reason. I was testing with the same data and everything, but still it wasn't working...

[grahamhughes]

if (a) {
    if (b) {
    }
}

And...

if ((a) && (b)) {
}

Will behave identically. The logic certainly cannot vary from device to device, since the semantics of "&&" are handled by the compiler, not the virtual machine.

Graham.