A simple string comparator for comparing two given values representing software versions constructed by only numbers (0 to 9) and dots as separators. It compares two strings that are formatted in a typical software version format using only numbers and dots. The comparator assumes only numeric versions are supplied, except for dot separators. There is no limit in length of a string.

• 0.0.7
• 1.3.3.7
• 6.9
• 6.0.0.6.5

When sorting, just pass a comparator instance:

List<String> list = new ArrayList<String>();
list.add("1.2.3.4");
list.add("1.0.2");
...
list.sort(new NumericalVersionComparator());

or just simply use the compare() method in NumericalVersionComparator as needed.