This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
because x+y is a compile time constants, since x and y is a compile time constant;
so compiler make sure that x+y dont overflow
here a+b is runtime expression. compiler cant evaluate them at compile time. it may not be fit in to byte .
in java arithmetic operation performed on operands that are below int ranges are resulted as int, normally.