I've been studying Java2 with the Beitel book Java How to Program, 5th
Edition.  It's a wonderful book for newbies, as I don't have much
programming experience beyond HTML and Unix file management.  I'm only
about 100 pages into it at this point, but I'm really cruising along!
My hat's off to Deitel for this nice piece of work.

So here's my question: I have a Mac running OS 10.X on my desk, and I
need to know exactly, SPECIFICALLY what software to install so I can
enter, compile and run my code on this computer.  It wasn't a problem
with my PC at home, but the Mac doesn't have a command line interface
window like the PC does, and I'm really not sure what to do.

This is a "company computer," so I needed to be as conservative as
possible with what I put on here;  huge, elaborate developer
environments, etc. are NOT feasible, nor are they really necessary at
my current skill level.  Keep in mind that the code I'm running now is
quite simple; as I said, I'm really a beginner, just past the "Hello
World" stage.  I just need to be able to compile and run little chunks
of code (e.g. the exercises at the end of the chapter), watch the
book's code samples run, etc. and nothing more - none of this stuff is
over 30-40 lines.

What do I need, specifically?  Just the bare-bones minimum.  Thanks!