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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What is the primary feature of a HashMap over a TreeMap?

HashMap maintains elements in insertion order
HashMap keeps its elements sorted
HashMap is optimized for rapid access
HashMap elements can be accessed sequentially

The correct answer is: HashMap is optimized for rapid access

A HashMap is a data structure that stores key-value pairs and is designed for fast access and retrieval. Unlike a TreeMap, which keeps its elements sorted, the elements in a HashMap are not sorted by default. This means that the elements in a HashMap do not have a particular order and cannot be accessed sequentially. Additionally, HashMaps are optimized for rapid access, meaning that they are more efficient at retrieving and storing data compared to TreeMaps. This is because HashMaps use a hashing function to quickly calculate the storage location for each key-value pair, while TreeMaps use a tree data structure that requires more comparisons and operations to insert, retrieve, and sort data. Therefore, the primary feature of a HashMap over a TreeMap is its efficiency in accessing and retrieving data.