Java Iterator is a cursor used to iterate over elements in the Java Collection Framework, allowing safe and sequential access to elements without exposing the internal structure. It provides essential methods like hasNext(), next(), and remove() for controlled iteration.
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What does the hasNext() method of Iterator return?
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Question 4 of 15
4. Question
Which method retrieves the next element in the collection?
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Question 5 of 15
5. Question
What happens if next() is called when no elements are left?
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Question 6 of 15
6. Question
Which of the following allows safe removal of elements during iteration?
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Question 7 of 15
7. Question
Can you use Iterator with a Map directly?
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Question 8 of 15
8. Question
Which loop is best suited when using an Iterator?
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Question 9 of 15
9. Question
Which of these is not a method of Iterator?
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Question 10 of 15
10. Question
How many directions does a standard Iterator support?
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Question 11 of 15
11. Question
Which interface extends Iterator and allows bidirectional traversal?
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Question 12 of 15
12. Question
What is the return type of remove() in Iterator?
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Question 13 of 15
13. Question
Can Iterator be used with arrays directly?
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Question 14 of 15
14. Question
Which of the following collections supports Iterator?
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Question 15 of 15
15. Question
What exception does Iterator’s remove() throw if next() is not called before it?
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Summary
The Java Iterator interface enables safe, sequential, forward-only traversal over collections like List and Set. It plays a crucial role in collection iteration, element removal, and memory-safe traversing in loops.
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