Multi criteria sorting of a list of objects with Guava Ordering

Question

I have a class WHICH CANNOT implement comparable, but needs to be sorted based on 2 fields. How can I achieve this with Guava?

Let\'s say the class is:

c         


        

Answer 1

I suspect you want Ordering.compound. You could do it all in one statement, but I'd use:

Ordering primary = Ordering.natural().onResultOf(stringValueSortFunction);
Ordering secondary = Ordering.natural()
                              .onResultOf(dateValueSortFunction)
                              .reverse();
Ordering compound = primary.compound(secondary);

List sortedList = compound.immutableSortedCopy(lotsOfX);