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 exception is thrown if you call 'array()' on a buffer not backed by an array?

UnsupportedOperationException
BufferUnderflowException
BufferOverflowException
ReadOnlyBufferException

The correct answer is: UnsupportedOperationException

The exception overloaded is UnsupportedOperationException. Generally excess capacity in the buffer, when calling array function which convert to an array, it will throw UnsupportedOperationException, as there is no array in the ByteBuffer. The other options, BufferUnderflowException, BufferOverflowException, and ReadOnlyBufferException, are all thrown when there is an issue with the buffer's position, limit, or read/write permissions, respectively. These are not applicable in this scenario as the issue is with the buffer not having an underlying array. Therefore, these options can be ruled out as the correct answer.