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!

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.