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.
You can use javac directly, so long as javac is in the path, i.e. linux knows what program you are on about when you type "javac" and where to find it. You can put your own packages anywhere, so long as you add them to your classpath when you run javac.