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

Which of these statements about auto-increment and auto-decrement operators is true?

1. They return the value before the operation

2. They perform the operation after producing the value

3. They cannot be used with float or double

4. They can only be used as standalone statements

The correct answer is: They perform the operation after producing the value

Auto-increment and auto-decrement operators perform the operation after producing the value. Option A is incorrect because it suggests that the value is returned before the operation, when in fact the operation is performed first. Option C is incorrect because auto-increment and auto-decrement operators can be used with float and double data types. Option D is incorrect because they can be used as part of a larger statement or expression, not just standalone statements.