How to sort two different objects in a collection?

Question

Suppose I have two classes CLassA and CLassB. And they have one atributte in common, for example the number of elements that each class holds.

How can i create a collect

Answer 1

Hmm.. is it possible for ClassA and ClassB to share an interface?

interface InterfaceZ
{
    int getCount();
}

class ClassA implements InterfaceZ
{
    int getCount() { return _myArray.length; }
}
class ClassB implements InterfaceZ
{
    int getCount() { return _complexCollection.size(); }
}

Then just sort the list like so:

List myArray;

... fill up array ...

Collections.sort(myArray, new Comparator() {
public int compare(InterfaceZ o1, InterfaceZ o2) {
    return o2.getCount() - o1.getCount();
}});