Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which of these is not a direct subtype of Collection?

Set
List
Queue
Map

The correct answer is: Map

All of the options are subtypes of Collection except for D Map. A Set is a subtype of Collection because it allows for multiple unique elements to be stored and does not allow for duplicates. A List is a subtype of Collection because it allows for a sequence of elements to be stored and allows for duplicates. A Queue is a subtype of Collection because it stores elements in a first-in, first-out manner. However, a Map is not a subtype of Collection because it does not store elements in a collection-like manner, but rather stores entries in a key-value pair format.