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by Goldy Lukka.
Original Post: Using Collections To Sort And Shuffle A List
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The class java.util.Collections contains many methods designed to operate on objects that implement the List interface. This utility class includes methods to perform a binary search on a list for a specified object, to copy the elements of one list into another, and to swap elements at specified positions in a list. In this tip, you will investigate two simple methods in the Collections class: shuffle() and rotate(). Then you'll use another Collections method, sort(), to sort items in a list. To sort there must be some way to compare objects. In this tip, you will sort using Comparable and later a Comparator.
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