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.
executeUpdate() is special form of execute(), that only performs DML Operations, while execute() performs any SQL Operation within the limitations of the support of database driver being used. That's why executeUpdate() returns int - No. of rows affected, while execute() returns boolean depending on the previous operation performed.