INTERVIEW PREP 2026 — Most Asked Questions!
Asked in TCS, Infosys, Wipro, Accenture & Startups

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JAVA / OOP QUESTIONS

Q1: What is the difference between Abstract Class and Interface?
ANS: Abstract class can have method body + constructor.
Interface has only abstract methods (before Java 8).
Use abstract class for IS-A, interface for CAN-DO.

Q2: What is method overloading vs overriding?
ANS: Overloading = same method name, different params (compile time)
Overriding = child class redefines parent method (runtime)

Q3: What is a NullPointerException? How to avoid it?
ANS: Accessing object/method on null reference.
Fix: Use Optional<>, null checks, or @NotNull annotation.

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DATABASE (SQL) QUESTIONS

Q4: Difference between WHERE and HAVING?
ANS: WHERE filters rows BEFORE grouping.
HAVING filters groups AFTER GROUP BY.
WHERE cannot use aggregate functions. HAVING can.

Q5: What are ACID properties?
ANS: A - Atomicity (all or nothing)
C - Consistency (valid state always)
I - Isolation (transactions don't interfere)
D - Durability (committed = permanent)

Q6: What is the difference between INNER JOIN and LEFT JOIN?
ANS: INNER JOIN = only matching rows from both tables
LEFT JOIN = all rows from left + matching from right

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HR ROUND QUESTIONS

Q7: Tell me about yourself?
FORMULA: Name + Degree + Skills + Project + Goal
EXAMPLE: 'I am [Name], pursuing BCA final year.
I am skilled in Java, React and SQL.
I built a Student Management System using Spring Boot.
I am looking to join a company where I can grow as
a full stack developer.'

Q8: Why should we hire you?
TIP: Mention 1 specific skill + 1 project + 1 soft skill
'I know React + Node JS, I have built 3 live projects,
and I learn fast and work well in teams.'

Q9: What is your biggest weakness?
SMART ANSWER: Turn it into a strength!
'I used to spend too much time perfecting code.
Now I set time limits and focus on working solutions first.'

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BONUS TIPS TO CRACK TECH INTERVIEWS

-> Practice 2 LeetCode Easy problems daily
-> Revise OOPS concepts every week
-> Always explain your thinking out loud
-> Have 2-3 projects ready to explain in detail
-> Ask 1 smart question at the end of interview
-> Dress formally even for online interviews!

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Want FREE projects to show in your interview?
Get full source code here:
https://t.me/Projectwithsourcecodes

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