Java Quiz

Answer 10 questions and see how you score!

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1. Which Java feature allows runtime polymorphism?

Method overriding

Method overloading

Encapsulation

Abstraction

2. Which exception is unchecked?

NullPointerException

IOException

SQLException

FileNotFoundException

3. Which interface represents asynchronous computation?

Future

Callable

Runnable

Executor

4. Which class is immutable?

String

StringBuilder

ArrayList

HashMap

5. Which keyword refers to current object?

this

self

super

object

6. Which method is the entry point of a Java program?

main()

start()

run()

init()

7. Which memory area stores class metadata?

Metaspace

Heap

Stack

Method Stack

8. Which keyword ensures single instance creation?

private constructor

static class

final class

abstract class

9. Which operator compares values?

10. Which lock allows multiple readers but single writer?

ReadWriteLock

Mutex

Semaphore

Monitor