I have an array of objects of type Entity, each of which has a "fitness" member that's a float:

Entity[] population;
...
class Entity implements Comparable {
 float fitness;
...
 public int compareTo(Object o)
 {
   Entity e = (Entity)o;
   int result = 0;
   
   if(fitness > e.fitness)
     result = 1;
   else if(e.fitness < fitness)
     result = -1;
   else
     result = 0;
   return result;
 }
}

Elsewhere, I try to sort the "population" array:

population = sort(population); // have to assign because sort doesn't operate in-place.

When I try to run it, I get this:

The method sort(byte[]) in the type PApplet is not applicable for the arguments (ImageEvolver.Entity[])

I'm at a loss, here.  I thought sort() was smart enough to sort arrays of objects.  What's the trick?

Thanks.

Processing is also my first exposure to Java, so there's a lot of newbie stuff I'm learning on that front too.