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Objects and Collections - Programming

Q1:

Which collection class allows you to associate its elements with key values, and allows you to retrieve objects in FIFO (first-in, first-out) sequence?

A java.util.ArrayList

B java.util.LinkedHashMap

C java.util.HashMap

D java.util.TreeMap

ANS:B - java.util.LinkedHashMap

LinkedHashMap is the collection class used for caching purposes. FIFO is another way to indicate caching behavior. To retrieve LinkedHashMap elements in cached order, use the values() method and iterate over the resultant collection.