31.) What happens if the “remove()” method of an Iterator is called without a preceding call to “next()”?
32.) Which collection does not directly implement the Iterable interface?
33.) Which interface does not allow duplicate elements and is commonly used to represent a mathematical set?
34.) Which collection interface is used for key-value associations and does not allow duplicate keys?
35.) Which interface in the Java Collections Framework allows elements to be stored in an unordered manner and does not provide positional access?
36.) Which collection interface is often used to implement data structures such as queues and double-ended queues (deque)?
37.) Which collection interface represents an ordered collection of elements without duplicate values?
38.) Which collection interface is commonly used to represent a first-in-first-out (FIFO) data structure?