Java quiz

Test your Java knowledge with a free interactive quiz — 50 questions with answers and explanations. No signup needed to play.

Java code is organized into packages. The role of `package` and `import` is:

1. Java code is organized into packages. The role of `package` and `import` is:
2. A lambda expression in Java represents:
3. What is the JVM?
4. Which collection is best when you need fast random access by index and rarely insert in the middle?
5. A `static` method in Java:
6. An `interface` in Java is:
7. A for-each loop in Java works on:
8. A `try { ... } catch { ... } finally { ... }` block:
9. Method overriding vs overloading — the difference is:
10. The `final` keyword can be applied to:
11. `Optional<T>` is used to:
12. What is the difference between JDK, JRE, and JVM?

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