Comparable

+------------------------------------------------------------------------------------+
¦               Comparable                ¦                Comparator                ¦
¦-----------------------------------------+------------------------------------------¦
¦ java.lang.Comparable                    ¦ java.util.Comparator                     ¦
¦-----------------------------------------+------------------------------------------¦
¦ int objOne.compareTo(objTwo)            ¦ int compare(objOne, objTwo)              ¦
¦-----------------------------------------+------------------------------------------¦
¦ Negative, if objOne < objTwo            ¦ Same as Comparable                       ¦
¦ Zero,  if objOne == objTwo              ¦                                          ¦
¦ Positive,  if objOne > objTwo           ¦                                          ¦
¦-----------------------------------------+------------------------------------------¦
¦ You must modify the class whose         ¦ You build a class separate from to sort. ¦
¦ instances you want to sort.             ¦ the class whose instances you want       ¦
¦-----------------------------------------+------------------------------------------¦
¦ Only one sort sequence can be created   ¦ Many sort sequences can be created       ¦
¦-----------------------------------------+------------------------------------------¦
¦ Implemented frequently in the API by:   ¦ Meant to be implemented to sort          ¦
¦ String, Wrapper classes, Date, Calendar ¦ instances of third-party classes.        ¦
+------------------------------------------------------------------------------------+

Source: stackoverflow.com

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