Well, since I was so stupid to install the java via terminal with official package, it stuck on the licence agreement screen, because I had to accept it, but no key from my keyboard worked to accept. So I've closed the terminal, killing my install. Now it says in newly opened terminal java is installed, but does not display in software center. The problem is, I want to uninstall it to get to the software center one.
Some more info: Why do I want java actually? Because I recently upgraded my graphicscard from onboard to radeon. So, my MineCraft would actually load up, but as soon as it has to load a map, it crashes. I looked in the log file it leaves behind, I don´t see any issues with my graphics, it says there is something wrong with my java. Can´t post output here because I've deleted the files. Since java isn´t working, I cannot create a new one. On my onboard card it worked, but it doesn't play good because that thing came out of '06. So since I've installed my official radeon drivers and plugged in my card it stopped working. My graphicscard isn´t broken too, because it still worked in Win 7. I had working the openjdk runtime 6 (which I meant in previous part too) on my onboard. I had to uninstall that, and install the official, which I think was the most worse choice, because I also could have reinstalled runtime 6 or even 7 from software center. Maybe the output from java -version could be handy:
java version "1.6.0_23" OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre11-0ubuntu126.96.36.199) OpenJDK Client VM (build 20.0-b11, mixed mode, sharing)
So, how could I uninstall an unfinished! install of java via terminal?
If needing more info, just ask for it!