comparator with null values

Question

We have some code which sorts a list of addresses based on the distance between their coordinates. this is done through collections.sort with a custom comparator.

How

Answer 1

Handle it like null means infinitely far away. Thus:

• comp(1234, null) == -1
• comp(null, null) == 0
• comp(null, 1234) == 1

With this, you get a consistent ordering.