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.

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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

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Fundamentals

Q1. What is an exception in Java? Easy

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

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

Type	Examples	Compile-time check
Checked	IOException, SQLException	Yes
Unchecked	NullPointerException, ArrayIndexOutOfBoundsException	No
Error	OutOfMemoryError, StackOverflowError	No

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Q4. What is the exception hierarchy in Java? Easy

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

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

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

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

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Q8. What is exception chaining? Medium

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

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

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Control Flow and finally

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

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

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

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

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Q13. What is try-with-resources? Medium

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

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Q14. What is a suppressed exception? Hard

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Q15. Can you have nested try blocks? Medium

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Q16. What is the order of catch blocks? Medium

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Custom and Advanced

Q17. How do you create a custom exception? Medium

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

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

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

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Q20. Can a constructor throw an exception? Medium

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

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

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Best Practices

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

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

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

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

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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.

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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.

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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.

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Exception Hierarchy Table

Level	Class	Recoverable	Compile-checked
Root	Throwable	n/a	no
Serious	Error	no	no
General	Exception	yes	yes (most)
Runtime	RuntimeException	sometimes	no

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Frequently Asked Questions

What is the most asked exception handling question in 2026?

Candidates report that the difference between checked and unchecked exceptions, and the behaviour of finally when try has a return, are the two most repeated questions in Java rounds.

Is try-with-resources important for interviews?

Yes. Interviewers expect you to use try-with-resources for any closeable resource and to explain that it auto-closes in reverse order of declaration and suppresses secondary exceptions rather than masking the primary one.

Can finally override a return value?

Yes, and it is a known trap. A return inside finally overrides any return or exception from try or catch, which is exactly why returning from finally is considered bad practice.

What is the difference between final, finally, and finalize?

final is a modifier for constants and non-overridable members, finally is the always-run block after try, and finalize is a deprecated pre-GC hook you should never rely on. Interviewers ask this to test attention to detail.

Should custom exceptions be checked or unchecked?

Make it checked when the caller can recover and you want to force handling; make it unchecked for programming errors or unrecoverable conditions. Modern codebases often lean unchecked to keep method signatures clean.

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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

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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.