Freshers (0–2 years)

Strings Interview Questions for Freshers

Preparing for your first Strings interviews? This set is curated for freshers and early-career developers (0–2 years): the 27 questions that come up most for entry-level roles, each with a clear answer, example code and follow-ups.

27Questions14Beginner13Intermediate

27 Strings questions

  1. 1StringBuilder vs StringBuffer vs String.Intermediate
  2. 2Find the longest palindromic substring.Intermediate
  3. 3Count total number of substrings in a string.Intermediate
  4. 4Find all permutations of a string.Intermediate
  5. 5Implement a basic version of 'atoi' (String to Integer).Intermediate
  6. 6Check if one string is a rotation of another.Intermediate
  7. 7String Compression (e.g., aabcccccaaa -> a2b1c5a3).Intermediate
  8. 8Longest Common Prefix among an array of strings.Intermediate
  9. 9Find the first non-repeating character in a string.Intermediate
  10. 10Check if two strings are Anagrams.Intermediate
  11. 11How to reverse a string in-place?Beginner
  12. 12What are Escape Characters?Beginner
  13. 13What is String Concatenation and its performance impact?Beginner
  14. 14Explain the difference between '==' and '.equals()' for strings.Beginner
  15. 15What is a Palindrome?Beginner
  16. 16How do you find the length of a string without built-in functions?Beginner
  17. 17What is the String Pool in Java/C#?Beginner
  18. 18Explain String Immutability.Beginner
  19. 19What is the difference between a String and a Character Array?Beginner
  20. 20What is a String and how is it stored in memory?Beginner
  21. 21Strings Interview Question 2 (Free)Intermediate
  22. 22Strings Interview Question 5 (Free)Intermediate
  23. 23Strings Interview Question 4 (Free)Beginner
  24. 24Strings Interview Question 1 (Free)Beginner
  25. 25Strings Advanced Interview Question 10Beginner
  26. 26Strings Advanced Interview Question 8Intermediate
  27. 27Strings Advanced Interview Question 7Beginner

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Frequently asked questions

Which Strings questions do freshers (0–2 years) get asked?

This page collects 27 Strings interview questions aligned with freshers (0–2 years), ranging across the difficulty levels that match that experience band.

How do I prepare for a Strings interview with my experience level?

Work through these questions in order, make sure you can explain each answer out loud, and pay attention to the real-world examples and follow-ups — interviewers at this level care as much about reasoning as the final answer.

Do the answers include code and examples?

Yes — answers include explanations, code examples where relevant, common mistakes to avoid and follow-up questions so you are ready for the full interview conversation.