Newbie Q: Class Privacy (or lack of)

[John Machin]

Ray wrote:

> The argument against this is that since development with Python is so
> rapid, you're supposed to always equip your code with extensive unit
> tests. I like Python but I've never really bought that argument--I
> guess I've been doing Java too long :)
>

In Java, if you don't always equip your code with extensive unit tests,
what sort of testing do you do?

When do you pick up typo errors that the compiler may not detect, like
blahblah*12.365 instead of blahblah*12/365 ?