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Skill Test · Java

Java Online Test for Hiring & Assessment

A Java online test evaluates a candidate's command of object-oriented design, the Collections framework, concurrency patterns, and modern Java features. It separates candidates who know Java's syntax from those who understand its memory model, threading semantics, and library idioms — the gaps that surface in code review and production incidents.

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Topic breakdown

What the Java test covers

OOP principles

Classes, interfaces, abstract classes, inheritance, polymorphism, encapsulation — including when to use each and common design pitfalls.

Java Collections

List, Set, Map, Queue implementations; iterator patterns; time complexity trade-offs between ArrayList, LinkedList, HashMap, TreeMap, and HashSet.

Multithreading & concurrency

Thread lifecycle, synchronized blocks, the java.util.concurrent package (ExecutorService, Future, CountDownLatch), and common race-condition patterns.

Exception handling

Checked vs unchecked exceptions, custom exception hierarchies, try-with-resources for AutoCloseable, and proper exception propagation design.

Java 8+ features

Lambda expressions, the Stream API (filter, map, collect, reduce), Optional, method references, and default interface methods.

Spring fundamentals

IoC container, dependency injection (constructor vs field), Spring Boot auto-configuration, @Component/@Service/@Repository stereotypes, and bean scopes.

Sample question

The kind of question candidates answer

Concurrency — mid level

Which statement about the following code is correct?

public class Counter {
    private int count = 0;

    public void increment() {
        count++;
    }

    public int get() {
        return count;
    }
}

Options

  • A. This class is thread-safe because count is a primitive.
  • B. This class is NOT thread-safe; count++ is not atomic. ✓ Correct
  • C. Marking increment() as synchronized is unnecessary overhead.
  • D. Using volatile on count makes increment() thread-safe.

What this question tests

Understanding that count++ compiles to a read-modify-write sequence that is not atomic in the JVM. Distinguishing between volatile (visibility guarantee only) and synchronized or AtomicInteger (atomicity guarantee). A common production mistake in Java backend code.

Who should take it

Roles this test screens for

Java / Backend Developer

Core screening for product and enterprise engineering teams hiring Java generalists or Spring Boot specialists.

Android Developer

Java fundamentals underpin Android development. Pair a Java core pack with Android-specific questions for mobile engineering roles.

Full-Stack / API Engineer

Teams building REST APIs on Spring Boot can screen for the OOP and concurrency foundations a senior engineer needs before the architecture interview.

Relevant for IT & technical hiring and campus recruitment in India.

Format & difficulty

Duration, format, and difficulty levels

Duration

30–90 min

Configurable per test

Format

MCQ + Live code

Output prediction + implementation

Levels

Junior — Senior

Separate packs by experience tier

FAQ

Common questions about the Java online test

How long is a Java online test?

A Java MCQ and output-prediction test typically runs 30–45 minutes. Tests that include live coding problems run 60–90 minutes. Duration is configurable by the admin.

Is the Java test free on AssessIQ?

AssessIQ has a free tier for running and reviewing assessments. Volume limits and advanced proctoring are part of paid plans. Check the pricing page for current tier limits.

What Java version does the test cover?

AssessIQ Java question packs focus on Java 8+ features — lambdas, streams, Optional, and the updated Collections API — alongside core language constructs stable across versions.

Does the Java test include Spring Framework questions?

Yes, at mid-level and senior tiers. Spring questions cover dependency injection, bean lifecycle, and Spring Boot auto-configuration. These are kept separate from the core Java question bank so admins can include or exclude them by role.

What score is considered good on a Java test?

Shortlist thresholds depend on the seniority level and the question mix. AssessIQ shows the score distribution across your candidate cohort so you can set thresholds relative to how your actual pool performs.

Can I screen Java candidates in bulk for campus placement?

Yes. Bulk invite via CSV, shareable test links, and concurrent session handling are available on all plans. Pairing a Java core pack with an aptitude section in a single timed session is supported.

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