Question: The JDK has the class HashSet that, like the Array List, can be initialized with a List. However, it does not hold duplicate elements. Use

The JDK has the class HashSet that, like the Array List, can be initialized with a List. However, it does not hold duplicate elements. Use a HashSet to amend the previous exercise so that it supports an option to display an alphabetical list of all the books currently on loan. It should not contain duplicates.

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