This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
What does this do with SCWCD? And which classes do these methods come from?
I don't think I've ever heard of inline methods in Java. In C++, these are methods that are copied verbatim by the compiler where they are called instead of generated machine code for a function call. I don't think Java has any similar concept.
As for callback methods, these are methods that are typically called by some code that you didn't write. For example, in GUI programming with Swing, it is common to create an event listener such as an ActionListener. In this interface, actionPerformed() is considered a callback function because it is usually called by code in the Java API that deals with the event queue.