Sorting ArrayList special issue

[garnaout]

I have a class Location that takes 3 parameters x y and z. I have an arraylist of Location and I am trying to sort these locations by ascending order.

Now I read about arraylist.sort() but how can I sort the locations according to a certain parameter, say the y parameter???

thanks

[eRaaaa]

Object Ordering (The Java™ Tutorials > Collections > Interfaces)
Collections (Java Platform SE 6), java.util.Comparator)
Comparator (Java Platform SE 6)

		Collections.sort(yourArrayList, new Comparator<Location>() {
			@Override
			public int compare(Location o1, Location o2) {
				return ..... //your logic here...
			}
		});

[garnaout]

well that's what I've been trying and I can't figure it out (sorry im a beginner)

I tried

 final Comparator<AddressLoc> highestLevel = 
                new Comparator<AddressLoc>() {

            @Override
            public int compare(AddressLoc o1, AddressLoc o2) {
                
                return o1.getZ().compareTo(o2.getZ());
            }

        };

and I get "Cannot invoke compareTo(int) on the primitive type int"

[eRaaaa]

Yes because you can`t invoke methods on primitives!
You could write return o1.getZ() - o2.getZ();
but that could lead to a wrong result.
but you could use some if statements (or ternary operator)?
if(o1.getZ() == o2.getZ()) return .... else if(o1.getZ() > o2.getZ()) return .... else return ....