A quick little Flash game, most likely, considering it seems to take teams of people to come up with anything more complicated (and in the case of Sierra Logic, anything more confusing).

About three years back a class of mine made a "massively" multiplayer version of pong. It was for an open house. It worked wonders on an elementary group that came by. Won us a ribbon too.

That's the only thing I've done from "scratch". I've made some maps, programmed an AI and done some network code for existing games.

Actually thinking back to high school, there was one flash project I did that might qualify as a game too.

Ahhh... I made a bunch of BASIC games when I was younger. They were all pretty simple. I mostly made what amounted to a choose your own adventure novel. They were awful. I worked on a few more complex games that were going to have real graphics and stuff, but I never got real far with them. I don't really have the attention span for coding.

I doubt you really want to learn Java for game development. Python plus Panda3D (http://www.panda3d.org/) will get you far further than any Java graphics library.

Java is more for enterprise applications. It used to be a good option for mobile development - then the iPhone came out and didn't support it.

Java supports OpenGL and OpenAL. (See http://lwjgl.org/ ) Plus, Java is used for Android applications. I'm currently developing a "casual" RPG in Java.

Some things I've worked on:
http://www.moddb.com/mods/the-orb-of-dilaaria (granted this is a Wolf3D mod/total conversion... lots of code changes)
http://www.moddb.com/games/star-wars-bloodlines (I contributed the game engine written from scratch in VB6).

A long, long time ago I made a bunch of games using some kind of a game making software that didn't require coding skills. More recently I've made very simple games using Java, including a really short text adventure game and a Dr Mario -clone.

Made a couple of tiny games. Mostly as exersice and boredom. Coded a game of snake and scorched earth and a 3D Pac man thingie on my TI-83 out of boredom in classes in school. Coded a game of tetris and minesweeper in MIDP 1.0 Java for my cellphone when first I got it.
Made a multiplayer scrabble game in Java because the IRC channel I was sitting around in couldn't find a decent scrabble game at the time.

Mostly though I've got many half-finished games and game ideas, but never finish them because I come to a stop once the time comes for adding graphics, user interaction and allowing cycles between manipulating the data to animate in.

Yeah I'm lazy.

Yea, I'm making one right now with some friends.
Also, I've made a few before, not that they were any good. :P

I made a few games in AGS once, long ago. Fun times.

Tried making a plane top down shooter for DOS in C and Allegro. The plane moved, the projectiles fired and hit, the enemies were programmed to move but didn't. Didn't really get around trying to solve the bug. I went to watch TV instead.

So ended my programming days.

I have a few game-making projects, but not any in a release-able sort of state.

I've made a Tetris clone once.

Also, I'm part of a team doing a remake of Deuteros, an old Amiga game.

Edit: Since people are listing technologies, the Tetris clone was made in C++, and has since been ported (almost) to C#.

The Deuteros remake is being done in C#.

I've made a few as part of class assignments and semester projects.

Most serious one I've made on my own was a text-based, turn-based strategi game.
The most serious I've made in a group was a naval RTS game where hand gestures as control scheme.

Oh, and to be clear, both were coded in C++ :p

You can actually do them completely in C++, see GemRB for an example - not a line of Java, yet it lets you run the Infinity Engine games on the phone (or tablet).

As for the topic: I haven't actually completed anything, save for a simple "maze" on the TI-89 calculator back in high school (and even then I'm not sure I managed to make any winning condition). I am working on a project though, using the already mentioned GemRB engine.