winkle
Test library
Technical Includes code

JavaJunior level.

Tests them on types and autoboxing, strings, the collections framework, and control flow that does what it looks like.

What's included

  • Only reviewed, approved questions
  • Every question editable before it’s sent
  • Timed at 35 minutes
  • Camera, screen and microphone recording
  • Leaving the tab is logged
  • Copy and paste blocked
  • Scored automatically, with reasons for written answers

What the 230 questions ask.

  • Multiple choice

    One right answer or several. Marked the moment they submit.

  • Code reading

    A snippet and one question: what does it do? Reading code, not just writing it.

Drawn from 60 topics

How many approved Junior questions the bank holds on each.

  • Maps9
  • Mockito9
  • Strings9
  • Exceptions8
  • Garbage collection8
  • Executors7
  • JUnit 57
  • Streams7
  • Threads7
  • Virtual threads7
  • Comparators6
  • Maven6
  • Memory areas6
  • Memory errors6
  • Classes & objects5
  • Collections framework5
  • CompletableFuture5
  • Inheritance & polymorphism5
  • Memory leaks5
  • Synchronization5
  • Types & autoboxing5
  • Boxing costs4
  • Concurrent collections4
  • Functional interfaces4
  • Lists4
  • Pattern matching4
  • Profiling tools4
  • REST APIs4
  • Strings & memory4
  • Deadlocks3
  • Enums3
  • Gradle3
  • HashMap internals3
  • Immutability3
  • JIT & warm-up3
  • Sets3
  • Spring Data JPA3
  • Benchmarking2
  • Build tools2
  • Collection complexity2
  • Generics2
  • Object methods2
  • Optional2
  • Primitive types2
  • Records2
  • Sealed types2
  • Security basics2
  • Spring Boot testing2
  • Spring DI2
  • Thread safety2
  • Variables & var2
  • I/O & files1
  • Interfaces1
  • Interfaces & default methods1
  • Iteration1
  • Lambdas1
  • Locks1
  • Memory model1
  • Packaging1
  • Transactions1

From test to shortlist in three steps.

  1. 01

    Pick a test

    Choose the skill and the level. Every question can be edited or swapped before anything is sent.

  2. 02

    Send one link

    Candidates take it in the browser from one link, against the clock.

  3. 03

    Read the scores

    Multiple choice marks itself. Written answers get a score with the reasoning behind it, so a surprising number can be checked.

About the Java test.

What employers ask before sending the Junior Java test, answered with its real figures.

  • How long does the Junior Java test take?

    20 questions in about 35 minutes. The clock is set to 35 minutes by default. Switch timing off in the test’s settings and the duration becomes a suggestion instead of a limit.

  • What kinds of questions are in it?

    It mixes multiple choice and code reading questions. Coding questions are answered in a code editor in the browser. Its questions run from intro to expert difficulty.

  • How is it scored?

    Automatically. Multiple choice marks itself the moment the candidate submits. Written answers are scored against a model answer, with partial credit for an answer that is partly right, and every written score comes with the reasoning behind it so a surprising one can be checked.

  • Which Java level should I send?

    Java comes at 4 levels: Junior (20 questions, 35 min), Mid (20 questions, 60 min), Senior (20 questions, 35 min) and Staff (20 questions, 35 min). Junior draws on introductory questions, Mid draws on intermediate questions, Senior draws on advanced questions and Staff draws on expert questions. Pick the level the role needs, not the one on the candidate’s CV.

  • Can I change the questions?

    Yes. Using a test puts a draft in your account, and you can edit, remove or swap any question before it goes to anyone.

  • How do you keep every result fair and honest?

    New tests start with camera, screen and microphone recording on, every time the candidate leaves the test tab logged, copy and paste blocked outside the code editor and questions hidden while the window isn’t in front, and printing blocked. Each is a switch in the test’s settings. You can also set how many times a candidate may leave the tab before the test submits itself, and shuffle the question order and answer options for each candidate.

  • Why can’t I see the questions on this page?

    A public page with the questions on it is an answer key for every candidate who finds it. Sign up free and using the test puts every question in front of you to review before anything is sent.

  • What does it cost?

    Nothing to start: sign up free, with no card. The plans and their limits are on the pricing page.

Send it today.

Sign up, and this test is waiting in your library, one click from a link you can send.