Android™ How to Program, Second Edition

J.6.1. Method sort

Method sort sorts the elements of a List, which must implement the Comparable interface. The order is determined by the natural order of the elements’ type as implemented by a compareTo method. Method compareTo is declared in interface Comparable and is sometimes called the natural comparison method. The sort call may specify as a second argument a Comparator object that determines an alternative ordering of the elements.

Sorting in Ascending or Descending Order

If list is a List of Comparable objects (such as Strings), you can use Collections method sort to order the elements in ascending order as follows:

Click here to view code image

Collections.sort( list ); // sort list into ascending order

You can sort the List in ...