I deploy with a resizable window. ;D
Same here.
I wonder why so many games don’t do that. It requires one line of code for LWJGL and -1 lines of code for Java2D.
I think it’s because people per code place elements at hard positions, within the game window. It’s easy for me to make a nice HUD that works wonders, if I can assume that my game is always the same resolution.
I just like to do grab the window dimensions every game update, and work from there 
I don’t think the coding is the problem. Some pixel artwork doesn’t scale well, and some games become easier if you can see more of the map (assuming the images don’t get enlarged, so that more fit into the window). But I agree, there are many programs (not only games) which needlessly use fixed window sizes.
My question was more or less to see what will fit conveniently onto someones screen. Some of my programs remember the last window size when you closed them, some don’t. For those which don’t I wanted to have some sensible default.
I agree, 800x600.
800x600 also, but allowing resize to anything, I just allow them to see extra stuff since I’m only doing singleplayer
I typically use a 1920x1080 monitor, so when i’m not using fullscreen I use 1600x900, but for my games that i’ve made the camera size is 940x560 and the window is scalable when not in fullscreen also, do you guys prefer bordered or borderless windows (ie. no close-resize-minimize buttons, no external frame)?
I prefer bordered, re-sizable, 800 x 600 windows. I prefer windowed display over full screen for most games, just because I like the option of doing many things at once while doing gaming. It is annoying to change music when games are forced into full screen. 
You can find the size of the screens without going fullscreen with GraphicsEnvironment.
By far my favorite for coding is 800x600. Its the perfect size! When im gaming however, fullscreen on either 1920x1080 or 1600x1440(i believe). 1440 is my second monitor,i do basically everything on it.
Actual screensize != preferred window size, at least for me. So I decided to ask here.
I like 800x480 or 1024x600
Why? Because they are widescreen, suggested by my GPU / OpenGL thingie and fit within my 1366x768 screen.
Usually fullscreen. If fullscreen is not available, forwhatever reason, I might use borderless desktop resolution or one step lower. I am at 1280x1024
My native resolution is 1650 x 1050 on my MacBook Pro.
I prefer to size my gaming window so that it takes all of the vertical space minus the height of the system menu bar. I never use the full width. Thus approximately 1000 x 1020.
I actually find it very annoying for games to take up the entire display if they really don’t need to.