Test Your Java Skills
Test your Java across core syntax and types, methods/overloading/scope, collections/generics/control flow, and exceptions/concurrency/idioms. 30 code-reading questions, instant score by category, free with no signup.
What is the Java Test?
This is a scenario-based Java test: 30 short code snippets, each followed by a question about what actually happens when it runs. A String comparison with == that quietly checks references instead of content. An Integer autoboxing cache that makes == appear to work below 128 and silently fail above it. A finally block that overrides a return value without anyone noticing. You pick the answer that matches what the code actually prints or does, not what looks like it should happen.
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The 30 questions cover four areas — core syntax and types, methods/overloading/scope, collections/generics/control flow, and exceptions/concurrency/idioms. Those four are the places where reading code and running code quietly diverge, and where a job posting's Strong Java usually turns out to mean something specific once you are in the interview. You get a score in each area, so a weak spot shows up as a weak spot rather than as a lower total.
It takes about nine minutes, there is no signup, and there is no code to write or compile — every question is read-and-predict, the same way a senior engineer reviews a pull request. Knowing the syntax and knowing what a specific snippet does at runtime are different skills, and this measures the second one.
What You'll Discover
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