Sorting objects in Java

gistfile1.java

class Derp {
	// hold the rank of each derp here
	int rank;
}
 
// now, we must make a comparator class which knows how to sort our Derp class:
class DerpComp implements Comparator<Derp> {
	public int compare(Derp a, Derp b) {
		// return -1 if a < b
		if(a.rank < b.rank)
			return -1;
		// return 1 if a > b
		else if(a.rank > b.rank)
			return 1;
		// return 0 if a = b
		else
			return 0;
	}
}
 
// now we can sort our derps!
Comparator<Derp> derpComp = new DerpComp();
Arrays.sort(derps, derpComp);
 
// and done!