In most distros it's "open GUI package manager, type password, search for 'java', pick the one that says 'java plug-in', hit 'apply.'
Again, information most people don't have. On Windows, it's "click here to download Java" and on the Mac, it's a dialog box that pops up asking if you want to install it, and OS X takes care of the rest.
using the commandline hasn't been required in at least a few years...
Broadly speaking, that is quite simply not true. But in terms of installing software from apt repositories, that's true. But not all distros have GUI repository software installed by default, and not all distros even use binary repositories. But more to the point, I was responding to the claim that a command line option was so much easier than doing it on Windows.
That GUI method is no more difficult to learn than the method for installing it on Windows or OS X
Absolutely false, sorry.
and for some users like my mother, it's a lot easier as it means they don't need to know where to download the item from, which file to get, where it should be saved on the computer, remember where they did save it, or what the filename is.
Fortunately, on Windows and the Mac, no one deals directly with the file anymore, it's all handled by the OS (on the Mac), and reasonably automated on Windows.
This is the same, lame, argument Linux proponents have been making for over a decade now, and it's no more true today than it was back then. Linux is not easier to use than Windows or OS X. The fact that Linux has such a paltry market share should clue you in to that.
And I like Linux. A lot. I can run it far better than I can run a Windows box (and I'm good with Windows as well). There are only a handful of things it does more easily for me than OS X does.