How to iterate over each value stored in a List

I have a function whose parameter is List<Long> l.

In the function there is a if statement for which I have to iterate over each value stored in the List<Long> l.

I'm trying to do this:

    public void myFunction(final List<Long> l) {

        final int size = l.size();

        for (int i = 0; i < size; i++){
           if (l.get(i) <= 900) {
              ...       
           Log.d("resultL", String.valueOf(l.get(i)));
           } else {
           }
        }

    }

here resultL logged only -64338

the values stored in the List<Long> l are [-64338, -15512, -15224, 8344], but what is happening is that the if statement is using only -64338 and doing the logic instead of using all the 4 values.

Why is this happening?

How to iterate over all the 4 values stored here and not just one?

Please help with this issue.