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.

What effect does a good hash function have?

It guarantees no collisions
It speeds up data retrieval
It decreases memory usage
It simplifies the code

The correct answer is: It speeds up data retrieval

A good hash function speeds up data retrieval by ensuring that data items are assigned to unique locations in a hash table, thereby eliminating the need for linear search. Option A is incorrect because even with a good hash function, collisions can still occur. Option C is incorrect because a good hash function does not necessarily decrease memory usage, as the hash table still needs to store the same amount of data. Option D is incorrect because a good hash function does not necessarily simplify the code, as it may still require complex algorithms and logic.