This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
1 and 2 are not same thing. 1 is identical to b=(byte) b+10; works fine. 2 does not compile because b is converted to int (due to + operator) and after adding 10, the result(int) can not be assigned to byte value.