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casting problem...from long to byte..

 
amit taneja
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Hi,
I m preparing for scjp and refering book by bertbates/kathy seera...

I m not able to clear one funda that while explicit casting from long to byte... when the value is greater then +127.

in that book ... in one page there is written about removing of higher order bits left to 8 lower order bits...and if last bit left in that 8 bits is 1 then the no. will be negative of remaining 7 bits

but in other page its witten about complement notation... i.e to find out the complement of the no. and add 1 to it..and then find out the final no. stored in byte...?

can any body pls tell me whats is all about and what is truth ..and even when we follow complement startergy but why so ???


answer in details ..

thanx and regards,
amit
 
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