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Java Iterators
Question 1
What is the purpose of an Iterator in Java?
- A
To modify elements in a collection
- B
To traverse a collection one element at a time
- C
To sort elements in a collection
- D
To store elements in a collection
Question 2
Which method of Iterator removes the last element returned by next()?
- A
delete()
- B
remove()
- C
discard()
- D
erase()
Question 3
Which type of Java collection supports ListIterator?
- A
Set
- B
Queue
- C
Map
- D
List
Question 4
How can you safely modify a collection while iterating through it?
- A
Using Iterator.remove()
- B
Using List.remove(Object) inside a loop
- C
Using collection.stream().forEach()
- D
Using for-each loop
Question 5
Which method of the Iterator interface removes the last element returned by the iterator?
- A
delete()
- B
remove()
- C
clear()
- D
discard()
Question 6
What happens if you modify a collection directly while iterating over it using a normal Iterator?
- A
It updates automatically
- B
Throws ConcurrentModificationException
- C
Skips modified elements
- D
The iterator restarts
Question 7
Which iterator type allows iteration in both directions in Java?
- A
Iterator
- B
Enumeration
- C
CollectionIterator
- D
ListIterator
There are 7 questions to complete.
