How to use Comparator in Java to sort

Question

I learned how to use the comparable but I\'m having difficulty with the Comparator. I am having a error in my code:

Exception in thread \"main\" java.lang.C         


        

Answer 1

public static Comparator JobEndTimeComparator = new Comparator() {
            public int compare(JobSet j1, JobSet j2) {
                int cost1 = j1.cost;
                int cost2 = j2.cost;
                return cost1-cost2;
            }
        };