Comparators

• 2 types of comparators
  • Comparable: for setting a DEFAULT sorting for all objects of a class
  • Comparator: for creating a special case sorting schema for an object
• Comparable usage
  1. Implement comparable to the class that you want to make sortable
  2. Implement the compare method in the class.
  3. Make it compare a field value in the two classes.
     1. Return n for earlier obj, +n for later obj
• Comparator usage
  1. Create a new class for your sorting schema. Implement the comparato
  2. SortByName implements comparator<Obj>
  3. Inside class, implement the compare method. Same way as for comparable.
  4. Feed new SortingSchema obj into the Collections.sort() method.