Core Java/Java 8 Assessment

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Core Java/Java 8 Assessment

Test your knowledge of Core Java and Java 8 with this comprehensive 30-question quiz. Whether you are a beginner or an experienced developer, this quiz is designed to challenge your understanding and application of Java programming concepts.

Key Features:

30 Multiple-Choice Questions
Covers Collections Framework, Exception Handling, and Java 8 Features
Instant Feedback on Your Answers

30 Questions8 MinutesCreated by CodingExplorer121

Which of these is not an interface in the Collections Framework?

Collection

Group

Set

List

Which interface restricts duplicate elements?

Set

List

Map

All of these

A HashMap allows the existence of:

A) null values

B) one null key

D) None of the above

C) All of the above

Which does NOT implement the Collection interface?

List

Map

Set

None of these

Which provides better performance for the insertion and removal from the middle of the list?

Vector

ArrayList

LinkedList

All of these

After resizing, size of ArrayList is increased by :

200%

50%

100%

None of these

HashSet internally uses?

Set

HashMap

List

Collection

Which of these is synchronized?

TreeMap

HashMap

Hashtable

All

Java does not support _________________?

Inheritance

Multiple inheritance for classes

Multiple inheritance of interfaces

Compile time polymorphism

Encapsulation concept in java is

Hiding complexity

Method hiding

Hiding constructor

None

Runtime polymorphism feature in java is

Method Overriding

Method Overloading

Constructor Overloading

Operator Overloading

For Cat and Animal class, correct way of inheritance in java is

Class Cat extends Animal

Class Animal extends Cat

Both are correct way

None is correct way

If I want to have common functions in a class and want to defer implementations of some other functions to derived classes, then we need to use

An Interface

An Abstract Class

A Static Class

None

Loose coupling in java programs can be done by

Using Interface

Encapsulating an object of another class

Both

None

False statement about static method in java

Belongs to class not object of the class

Can be called without any object creation of a class

Can access non static and static variables both.

All are correct

Which of these is a super class of all errors and exceptions in the Java language?

Catchable

Throwable

RunTimeException

None of these

Which exception is thrown when divide by zero statement executes?

NumberFormatException

NullPointerException

ArithmeticException

None of these

What exception thrown by parseInt() method?

ArithmeticException

ClassNotFoundException

NullPointerException

NumberFormatException

Which is not a primitive data type?

Boolean

Character

Arrays

Integer

What is the default value of boolean?

True

False

'1'

'0'

Given the code:

String s1 = ” yes” ;

String s2 = ” yes ” ;

String s3 = new String ( s1);

Which of the following would equate to true?

What is garbage collection in the context of Java?

The operating system periodically deletes all of the java files available on the system

Any package imported in a program and not used is automatically deleted.

When all references to an object are gone, the memory used by the object is automatically reclaimed

The JVM checks the output of any Java program and deletes anything that doesn’t make sense.

When all references to an object are gone the memory used by the object is not reclaimed.

Lambda expressions in java 8 are based on

Procedural programming

Functional programming

Data programming

All

In Java 8 Interfaces, methods can be:

Default

Abstract

All

None

Stream operations in java 8 can be divided into

Terminal types

Intermediate types

All

None

In java 8 Function is ?

Class

Interface

Lambda Expression

Object

What can help us in avoiding NullPointeExceptions and null checks in java 8

Optional

Required

NotNull

NotRequired

Functional interfaces method is

Static

Abstract

Final

None

Core Java/Java 8 Assessment

Core Java/Java 8 Assessment

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