Eclipse: stop code from running (java)
Solution 1:
Open the Console view, locate the console for your running app and hit the Big Red Button.
Alternatively if you open the Debug perspective you will see all running apps in (by default) the top left. You can select the one that's causing you grief and once again hit the Big Red Button.
Solution 2:
For newer versions of Eclipse:
open the Debug perspective (Window > Open Perspective > Debug)
select process in Devices list (bottom right)
Hit Stop button (top right of Devices pane)
Solution 3:
I have a .bat file on my quick task bar (windows) with:
taskkill /F /IM java.exe
It's very quick, but it may not be good in many situations!