Free Java MCQ Test — Online Quiz with Instant Score

Topic-wise Java multiple-choice questions at real fresher-interview level — Core Java, OOP, collections and more. Written by the trainers who run our placement mock interviews.

🧪 2,90,000+ tests taken 📚 600+ Java questions ⚡ Instant score 🆓 Completely free

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How it works

Three steps between you and an honest score.

Open the testOne quick registration on our test portal — used by 2,90,000+ test attempts so far.

Answer the MCQsTopic-wise multiple-choice questions at fresher interview level.

Get your score instantlySee what you got right, where you are weak, and what to revise next.

What the test covers

Questions are written and reviewed by our trainers — the same topics interviewers test.

Core Java basicsOOP conceptsStringsCollectionsException handlingMultithreading basicsArrays & loopsInterview-level traps

Sample questions

A taste of the difficulty level — click a question to reveal the answer.

Q1. What is the output of: System.out.println(10 + 20 + "30");Click to reveal answer ▾

A. 102030

B. 3030 ✓

C. 60

D. Compilation error

Why: Evaluation is left to right: 10 + 20 = 30 (integer addition), then 30 + "30" becomes string concatenation, giving "3030".

Q2. Which collection class does NOT allow duplicate elements?Click to reveal answer ▾

A. ArrayList

B. LinkedList

C. HashSet ✓

D. Vector

Why: Sets are defined by uniqueness — HashSet rejects duplicates using hashCode() and equals(). All List implementations allow duplicates.

Q3. String s = new String("java"); — how many objects can this create?Click to reveal answer ▾

A. Always one

B. One or two ✓

C. Always two

D. Zero

Why: The new keyword always creates one heap object. If "java" is not already in the string pool, the literal creates a second, pooled object.

Q4. Which of these is NOT a pillar of OOP?Click to reveal answer ▾

A. Encapsulation

B. Polymorphism

C. Compilation ✓

D. Inheritance

Why: The four pillars are encapsulation, inheritance, polymorphism and abstraction. Compilation is a build step, not an OOP concept.

Q5. What does the final keyword on a method mean?Click to reveal answer ▾

A. The method runs last

B. The method cannot be overridden ✓

C. The method cannot be called twice

D. The method is static

Why: final on a method blocks overriding in subclasses; final on a class blocks extension; final on a variable makes it a constant.

Who should take this test

Freshers preparing for placement drives — most campus aptitude rounds include Java MCQs in exactly this format.
Students mid-way through a Java course — find your weak topics before the syllabus moves on.
Anyone facing a Java interview soon — pair the test with our 43 Core Java interview questions for the verbal round.
Career switchers testing the waters — see how much Java you actually absorbed from self-study.

Frequently asked questions

Is the Java MCQ test really free?

Yes — completely free with instant scoring. Over 2,90,000 test attempts have been taken on our portal by students preparing for placements.

Do I need to create an account?

A quick one-time registration on the test portal is needed so your scores are saved and you can track improvement across attempts.

What level are the questions?

Fresher interview level — the same difficulty you face in campus placement aptitude rounds and first-round technical screenings. Questions are written and reviewed by The Kiran Academy trainers.

How does this help my placement?

At The Kiran Academy, test performance is part of placement eligibility — our placement team uses test scores to certify students as interview-ready. For external users, it is an honest diagnostic of what to revise.