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 does Map.put(key, value) do?

Adds a key if it doesn't exist
Associates the specified value with the specified key
Ensures the map contains the specified key-value pair
Replaces the value for the specified key if it exists

The correct answer is: Associates the specified value with the specified key

Map.put(key, value) does not add a key if it doesn't exist, contrary to option A. Instead, it associates the specified value with the specified key. Option C is incorrect because Map.put(key, value) does not ensure that the map contains the specified key-value pair, it actually adds or replaces the value for the given key. Similarly, option D is incorrect because Map.put(key, value) does not replace the value for the specified key if it exists. Instead, it adds or replaces the value for the specified key without checking if it already exists. This means if the same key is put multiple times, the latest value will be associated with the key.