Java Exception Handling Interview Questions 2026: 26 Q&A

Last Updated: June 2026 | Level: Freshers to Mid-Level | Read Time: ~15 min

Exception handling is a guaranteed topic in Java interviews. Candidates report that interviewers love the checked-versus-unchecked distinction, the finally plus return trap, and custom exception design. This guide covers 26 questions with full answers, runnable code, and the gotchas interviewers use to separate rote learners from people who understand control flow. Behaviour reflects the official Oracle Java tutorials; confirm spec-level details against JLS chapter 11.

Pair this with Java Interview Questions 2026 and Java OOPs Interview Questions 2026.

Table of Contents

1. Fundamentals (Q1 to Q9)
2. Control Flow and finally (Q10 to Q16)
3. Custom and Advanced (Q17 to Q22)
4. Best Practices (Q23 to Q26)
5. Predict the Output
6. Exception Hierarchy Table
7. Frequently Asked Questions

Fundamentals

Q1. What is an exception in Java? Easy

Q2. What is the difference between an error and an exception? Easy

Q3. What is the difference between checked and unchecked exceptions? Medium

Q4. What is the exception hierarchy in Java? Easy

Q5. What is the difference between throw and throws? Easy

Q6. Can a try block exist without a catch? Medium

Q7. Can you catch multiple exceptions in one catch? Medium

try { risky(); }
catch (IOException | SQLException e) { log(e); }

Q8. What is exception chaining? Medium

catch (SQLException e) {
    throw new DataAccessException("query failed", e);   // preserves cause
}

Q9. What happens if an exception is not caught anywhere? Medium

Control Flow and finally

Q10. What is the finally block and when does it run? Easy

Q11. Does finally run if there is a return in try? Hard

int test() {
    try { return 1; }
    finally { return 2; }   // overrides; method returns 2
}

Q12. What happens if both try and finally throw exceptions? Hard

Q13. What is try-with-resources? Medium

try (BufferedReader br = new BufferedReader(new FileReader("f.txt"))) {
    return br.readLine();
}   // br.close() called automatically

Q14. What is a suppressed exception? Hard

Q15. Can you have nested try blocks? Medium

Q16. What is the order of catch blocks? Medium

Custom and Advanced

Q17. How do you create a custom exception? Medium

class InsufficientFundsException extends RuntimeException {
    InsufficientFundsException(String msg) { super(msg); }
}

Q18. When should a custom exception be checked vs unchecked? Hard

Q19. What is the difference between final, finally, and finalize? Medium

Q20. Can a constructor throw an exception? Medium

Q21. What happens to an exception thrown in a finally during stack unwinding? Hard

Q22. How does exception handling work with method overriding? Hard

Best Practices

Q23. Why is catching Exception or Throwable broadly bad? Medium

Q24. Why should you not use exceptions for control flow? Medium

Q25. What should you log when handling an exception? Easy

Q26. What is the cost of throwing an exception? Hard

Predict the Output

Snippet 1

public static int f() {
    try { return 1; }
    finally { System.out.println("finally"); }
}
System.out.println(f());

Output:

finally
1

Why: finally runs after the return value (1) is computed but before the method returns, so "finally" prints first, then the returned 1.

Snippet 2

try {
    int[] a = new int[2];
    a[5] = 1;
    System.out.println("after");
} catch (ArrayIndexOutOfBoundsException e) {
    System.out.println("caught");
} finally {
    System.out.println("done");
}

Output:

caught
done

Why: The out-of-bounds write throws before "after" prints, control jumps to the matching catch, then finally always runs.

Snippet 3

public static int g() {
    try { return 1; }
    finally { return 2; }
}
System.out.println(g());

Output:

2

Why: A return inside finally overrides the try's return. The method returns 2, the value 1 is discarded. This is the classic trap question.

Exception Hierarchy Table

Related Articles

• Java Interview Questions 2026, the master 50-question set
• Java OOPs Interview Questions 2026, OOP foundations
• Java Multithreading Interview Questions 2026, concurrency rounds
• Java String Interview Questions 2026, strings and immutability

Confirm any spec-level exception semantics against the official JLS and Oracle tutorials before your interview. This guide reflects candidate-reported patterns and public preparation resources as of June 2026.