When comparing two Issue objects, you need to check both volume and number value

Question

When comparing two Issue objects, you need to check both volume and number values. Under what conditions, the compareTo() should return -1? 0? and 1?

Basically i'm asking when you have an object that needs to be sorted by an int volume and int number. How would I implement the compareTo method for it to be able to do that?

It's called like so:

Issue (int vol, int num)

so sort the ArrayList<Issue> issues by volume and number using Collections.sort(issues). Im just stuck on how to implement the compareTo method for both the volume AND number.

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