Java Quiz

Answer 10 questions and see how you score!

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1. Which memory model ensures consistency?

Java Memory Model

Thread Model

CPU Model

Heap Model

2. What is JVM responsible for?

Running Java bytecode

Writing Java code

Compiling source code

Memory allocation only

3. Which collection is synchronized by default?

Vector

ArrayList

HashMap

LinkedList

4. Which Java feature allows runtime polymorphism?

Method overriding

Method overloading

Encapsulation

Abstraction

5. Which keyword prevents method overriding?

final

static

abstract

private

6. Which API introduced Stream API?

Java 8

Java 7

Java 6

Java 5

7. Which keyword ensures thread safety for methods?

synchronized

volatile

static

final

8. Which keyword stops thread execution temporarily?

sleep()

wait()

stop()

pause()

9. Which exception is unchecked?

NullPointerException

IOException

SQLException

FileNotFoundException

10. Which collection does not allow duplicates?

Set

List

Array

Map