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!

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Which statement is true about TreeSet?

TreeSet does not allow duplicate elements
TreeSet allows rapid removals and insertions
TreeSet maintains elements in a random order
TreeSet is not based on the Set interface

The correct answer is: TreeSet does not allow duplicate elements

TreeSet is a collection in Java that does not allow duplicate elements to be stored. This is because it implements the Set interface, which does not allow duplicate elements. Option B is incorrect because while TreeSet does allow for rapid removals and insertions, this is not a defining characteristic of the collection. Option C is incorrect as TreeSet maintains elements in a sorted order, not a random order. Option D is incorrect because TreeSet is indeed based on the Set interface in Java.