Baldwin shows you how to use the reverseOrder method of the Collections class to sort a list into reverse natural order. Also how to reverse the order of the elements in a list.

Baldwin shows you how to use the sort method of the Collections class along with a Comparator object to sort the contents of a List into reverse natural order.

Baldwin shows you how to extract the contents of a collection into an array, and how to use a Comparator object to sort the contents of the array into reverse natural order.

Baldwin shows you how to use a Comparator to cause a TreeSet collection to be sorted in descending order while preserving the impact of differences in case.

Here's how to use a Comparator object to achieve a natural ordering on a set of names added to a TreeSet collection while ignoring the case used to write the names.

Baldwin explains that the core collection interfaces in the Java Collections Framework allow collections to be manipulated without regard for how they are implemented.

There are six core interfaces in the Collections Framework. Each interface declares several methods and provides a contract that applies to each declared method. The method declarations and their associated contracts specify the general behavior of matching methods in the classes that implement the interfaces.

Baldwin explains some of the details surrounding the use of a Java collection for creating data structures.

Baldwin introduces you to the Java Collections Framework. Once you learn how to use it, you'll never need to reinvent common data structures and algorithms again.