I wouldn't work with an int at all with unknown sized data. Use a List<Integer> since you don't need to resize it. Lists have a bonus as well, they are both sortable by collections and also allow the use of Collections.min on them, so that makes the other methods a little on the useless side.
I don't know what your input data is. It appears it should take the format of:
x, x, x, x, x
x, x, x, x, x, x, x
x, x, x
Is that right? Given the findMins method I'd expect you want to provide the above data, and then for each line you want to show the minimum independent of the other lines, is that right?
BTW, I'd personally use a StringTokenizer instead of the scanner for this.