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.
In general, Yes. Just as you would place class files in a jar; by using the jar tool. jar command doesnt differentiate between class files or any other files, all files in the target directory are included in the generated jar.