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

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Want to excel in Java? Test your knowledge with our ultimate quiz based on 'Thinking in Java'. Engage with multiple-choice questions and in-depth explanations. Boost your understanding and prepare for your exam with confidence.

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.