How to Sort a 2D array?

Question

I need help with sorting 2D array. I\'ve got array with two rows

[5, 3, 4, 1, 2]
[10,20,30,40,50]

and I need to sort it to look like this:

Answer 1

You can use Comparator to do that. This thread has some useful information for C++ . Sample code in Java is like,

Arrays.sort(a, new Comparator() {

        @Override
        public int compare(Long[] o1, Long[] o2) {

            Long t1 = o1[1];
            Long p1 = o1[0];
            Long t2 = o2[1];
            Long p2 = o2[0];

            if (t1 == t2) {
                return (p1 > p2 ? 1 : (p1 == p2 ? 0 : -1));
            } else {
                return (t1 < t2 ? -1 : 1);
            }

        }
    });

Do your comparison login in compare method and return the relevant values to sort the array accordingly.