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

In the context of Thread safety, Random.nextInt() is noted to be:

1. Not thread-safe

2. Thread-safe

3. Only safe in synchronized blocks

4. Safe without any restrictions

The correct answer is: Thread-safe

Random.nextInt() method is noted to be thread-safe because it is able to be used with multiple threads without causing race conditions. This eliminates the need for synchronized blocks which can slow down the performance of the program. Options A, C, and D are incorrect because Random.nextInt() does not have any restrictions on when or how it can be used, making it suitable for use in multiple threads at the same time. Additionally, it does not require synchronized blocks to ensure thread safety, making option C incorrect. Option A is also incorrect as it suggests that Random.nextInt() is not safe to be used with multiple threads, which is not the case. Therefore, the correct answer is B.