Java quiz

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

What is the difference between JDK, JRE, and JVM?

1. What is the difference between JDK, JRE, and JVM?
2. The `final` keyword can be applied to:
3. Java code is organized into packages. The role of `package` and `import` is:
4. A for-each loop in Java works on:
5. Method overriding vs overloading — the difference is:
6. Generic types like `List<String>` allow:
7. An `interface` in Java is:
8. `HashMap` vs `TreeMap` — the key difference is:
9. In Java, what is the difference between primitive types and reference types?
10. `this` and `super` refer to:
11. Streams (`Stream<T>`, introduced in Java 8) are best described as:
12. `Optional<T>` is used to:

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