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Refreshing Core Java: A Quick Revision for Experienced Developers — 2

SAKSHI K

5 min readMar 21, 2025

Refreshing Core Java: A Quick revision for Experienced Developer — 1 : Link

Below are 20 Java questions for experienced developers, along with their answers:

1. What is the difference between `Iterator` and `ListIterator` in Java?

Answer:

Iterator allows iteration in one direction (forward) and can be used with any Collection (e.g., List, Set).
ListIterator is an extension of Iterator and allows bidirectional iteration (forward and backward). It can only be used with List collections and also allows modification of the collection while iterating.

2. What is the purpose of the `clone()` method in Java?

Answer: The clone() method is used to create a copy (clone) of an object. By default, the clone() method performs a shallow copy, meaning the object’s fields are copied, but the references to objects inside the object are not cloned (they point to the same memory address).

3. What is the difference between `String` and `StringBuilder`/`StringBuffer` in terms of performance?

TechStack Journal

Refreshing Core Java: A Quick Revision for Experienced Developers — 2

1. What is the difference between `Iterator` and `ListIterator` in Java?

2. What is the purpose of the `clone()` method in Java?

3. What is the difference between `String` and `StringBuilder`/`StringBuffer` in terms of performance?

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Written by SAKSHI K

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Refreshing Core Java: A Quick Revision for Experienced Developers — 2

1. What is the difference between Iterator and ListIterator in Java?

2. What is the purpose of the clone() method in Java?

3. What is the difference between String and StringBuilder/StringBuffer in terms of performance?

Create an account to read the full story.

Published in TechStack Journal

Written by SAKSHI K

No responses yet

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1. What is the difference between `Iterator` and `ListIterator` in Java?

2. What is the purpose of the `clone()` method in Java?

3. What is the difference between `String` and `StringBuilder`/`StringBuffer` in terms of performance?