Most asked top Interview Questions and Answers & Online Test
Education platform for interview prep, online tests, tutorials, and live practice

Build skills with focused learning paths, mock tests, and interview-ready content.

WithoutBook brings subject-wise interview questions, online practice tests, tutorials, and comparison guides into one responsive learning workspace.

Search the library
Prepare Interview
Ask Question

Mock Exams

Make Homepage

Bookmark this page

Subscribe Email Address
Home / Interview Subjects / OOPs
WithoutBook LIVE Mock Interviews OOPs Related interview subjects: 74

Interview Questions and Answers

Know the top OOPs interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 30 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top OOPs interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

Search a question to view the answer.

Freshers / Beginner level questions & answers

Ques 2

What is inheritance in OOP?

Inheritance is a mechanism where a new class inherits properties and behaviors from an existing class. It promotes code reusability and establishes a relationship between classes.
Save For Revision

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library
Is it helpful?
Add Comment View Comments
Ques 3

What is a constructor?

A constructor is a special method in a class that is automatically called when an object of the class is created. It is used for initializing object properties.

Example:

class Car {
  constructor(make, model) {
    this.make = make;
    this.model = model;
  }
}
Save For Revision

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library
Is it helpful?
Add Comment View Comments
Ques 4

What is the 'super' keyword used for?

The 'super' keyword is used to call the constructor or methods of the parent class in a subclass. It is often used to access the superclass's methods or properties.

Example:

class Child extends Parent {
  constructor() {
    super();
  }
}
Save For Revision

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library
Is it helpful?
Add Comment View Comments
Ques 5

What is the 'this' keyword in OOP?

The 'this' keyword refers to the current instance of the class. It is used to access the current object's properties and methods within that class.

Example:

class Person {
  constructor(name) {
    this.name = name;
  }
  greet() {
    console.log('Hello, ' + this.name + '!');
  }
}
Save For Revision

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library
Is it helpful?
Add Comment View Comments
Ques 6

What is a static method in a class?

A static method is a method that belongs to the class rather than an instance of the class. It is called on the class itself, not on an object created from the class.

Example:

class MathUtils {
  static add(a, b) {
    return a + b;
  }
}
Save For Revision

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library
Is it helpful?
Add Comment View Comments
Ques 7

What is an interface in Java?

In Java, an interface is a collection of abstract methods. A class implements an interface, providing concrete implementations for all its methods. It allows for achieving multiple inheritance in Java.

Example:

interface Printable {
  void print();
}
Save For Revision

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library
Is it helpful?
Add Comment View Comments
Ques 8

What is the role of the 'super()' statement in a constructor?

The 'super()' statement is used in a subclass constructor to call the constructor of its superclass. It initializes the inherited properties and ensures that the superclass's constructor is executed before the subclass's constructor.

Example:

class Subclass extends Superclass {
  constructor() {
    super();
  }
}
Save For Revision

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library
Is it helpful?
Add Comment View Comments
Ques 9

What is the purpose of the 'sealed' keyword in C#?

In C#, the 'sealed' keyword is used to prevent a class from being inherited. It ensures that the class cannot be used as a base class for other classes.

Example:

sealed class MySealedClass {
  // class content
}
Save For Revision

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library
Is it helpful?
Add Comment View Comments

Most helpful rated by users:

Related interview subjects

Technical Support interview questions and answersTotal 30 questionsMainframe interview questions and answersTotal 20 questionsHadoop interview questions and answersTotal 40 questionsBanking interview questions and answersTotal 20 questionsCheckpoint interview questions and answersTotal 20 questionsBlockchain interview questions and answersTotal 29 questionsSales interview questions and answersTotal 30 questionsNature interview questions and answersTotal 20 questionsChemistry interview questions and answersTotal 50 questionsDocker interview questions and answersTotal 30 questionsCollege Teachers interview questions and answersTotal 30 questionsSDLC interview questions and answersTotal 75 questionsCryptography interview questions and answersTotal 40 questionsRPA interview questions and answersTotal 26 questionsInterview Tips interview questions and answersTotal 30 questionsGIT interview questions and answersTotal 30 questionsBlue Prism interview questions and answersTotal 20 questionsMemcached interview questions and answersTotal 28 questionsSSB interview questions and answersTotal 30 questionsAlgorithm interview questions and answersTotal 50 questionsBusiness Analyst interview questions and answersTotal 40 questionsSplunk interview questions and answersTotal 30 questionsDevOps interview questions and answersTotal 45 questionsAccounting interview questions and answersTotal 30 questionsOSPF interview questions and answersTotal 30 questionsSqoop interview questions and answersTotal 30 questionsJSON interview questions and answersTotal 16 questionsAccounts Payable interview questions and answersTotal 30 questionsComputer Graphics interview questions and answersTotal 25 questionsIoT interview questions and answersTotal 30 questionsInsurance interview questions and answersTotal 30 questionsScrum Master interview questions and answersTotal 30 questionsActive Directory interview questions and answersTotal 30 questionsLaravel interview questions and answersTotal 30 questionsXML interview questions and answersTotal 25 questionsGraphQL interview questions and answersTotal 32 questionsBitcoin interview questions and answersTotal 30 questionsMicroservices interview questions and answersTotal 30 questionsApache Kafka interview questions and answersTotal 38 questionsTableau interview questions and answersTotal 20 questionsAdobe AEM interview questions and answersTotal 50 questionsKubernetes interview questions and answersTotal 30 questionsOOPs interview questions and answersTotal 30 questionsFashion Designer interview questions and answersTotal 20 questionsDesktop Support interview questions and answersTotal 30 questionsIAS interview questions and answersTotal 56 questionsPHP OOPs interview questions and answersTotal 30 questionsNursing interview questions and answersTotal 40 questionsLinked List interview questions and answersTotal 15 questionsDynamic Programming interview questions and answersTotal 30 questionsSharePoint interview questions and answersTotal 28 questionsCICS interview questions and answersTotal 30 questionsYoga Teachers Training interview questions and answersTotal 30 questionsSchool Teachers interview questions and answersTotal 25 questionsLanguage in C interview questions and answersTotal 80 questionsBehavioral interview questions and answersTotal 29 questionsFull-Stack Developer interview questions and answersTotal 60 questionsStatistics interview questions and answersTotal 30 questionsDigital Marketing interview questions and answersTotal 40 questionsApache Spark interview questions and answersTotal 24 questionsVISA interview questions and answersTotal 30 questionsIIS interview questions and answersTotal 30 questionsSystem Design interview questions and answersTotal 30 questionsSEO interview questions and answersTotal 51 questionsGoogle Analytics interview questions and answersTotal 30 questionsCloud Computing interview questions and answersTotal 42 questionsBPO interview questions and answersTotal 48 questionsANT interview questions and answersTotal 10 questionsAgile Methodology interview questions and answersTotal 30 questionsHR Questions interview questions and answersTotal 49 questionsREST API interview questions and answersTotal 52 questionsContent Writer interview questions and answersTotal 30 questionsSAS interview questions and answersTotal 24 questionsControl System interview questions and answersTotal 28 questions

All interview subjects

Microsoft .NET interview questions and answersTotal 60 questionsASP interview questions and answersTotal 82 questionsLINQ interview questions and answersTotal 20 questionsC# interview questions and answersTotal 41 questionsASP .NET interview questions and answersTotal 31 questionsAmazon SageMaker interview questions and answersTotal 30 questionsTensorFlow interview questions and answersTotal 30 questionsHugging Face interview questions and answersTotal 30 questionsGemini AI interview questions and answersTotal 50 questionsOracle AI Agents interview questions and answersTotal 50 questionsArtificial Intelligence (AI) interview questions and answersTotal 47 questionsMachine Learning interview questions and answersTotal 30 questionsGoogle Cloud AI interview questions and answersTotal 30 questionsIBM Watson interview questions and answersTotal 30 questionsPerplexity AI interview questions and answersTotal 40 questionsChatGPT interview questions and answersTotal 20 questionsNLP interview questions and answersTotal 30 questionsAI Agents (Agentic AI) interview questions and answersTotal 50 questionsOpenCV interview questions and answersTotal 36 questionsEmbedded C interview questions and answersTotal 30 questionsC++ interview questions and answersTotal 142 questionsVBA interview questions and answersTotal 30 questionsCOBOL interview questions and answersTotal 50 questionsR Language interview questions and answersTotal 30 questionsPython Coding interview questions and answersTotal 20 questionsScala interview questions and answersTotal 48 questionsSwift interview questions and answersTotal 49 questionsGolang interview questions and answersTotal 30 questionsCCNA interview questions and answersTotal 40 questionsOpenStack interview questions and answersTotal 30 questionsServiceNow interview questions and answersTotal 30 questionsSnowflake interview questions and answersTotal 30 questionsOracle APEX interview questions and answersTotal 23 questionsOracle Cloud Infrastructure (OCI) interview questions and answersTotal 100 questionsAWS interview questions and answersTotal 87 questionsMicrosoft Azure interview questions and answersTotal 35 questionsAzure Data Factory interview questions and answersTotal 30 questionsDPDP interview questions and answersTotal 30 questionsPIPEDA interview questions and answersTotal 20 questionsCCPA interview questions and answersTotal 20 questionsGDPR interview questions and answersTotal 30 questionsHITRUST interview questions and answersTotal 20 questionsLGPD interview questions and answersTotal 20 questionsPDPA interview questions and answersTotal 20 questionsOSHA interview questions and answersTotal 20 questionsHIPPA interview questions and answersTotal 20 questionsPHIPA interview questions and answersTotal 20 questionsFERPA interview questions and answersTotal 20 questionsComputer Science interview questions and answersTotal 50 questionsOperating System interview questions and answersTotal 22 questionsMS Word interview questions and answersTotal 50 questionsTips and Tricks interview questions and answersTotal 30 questionsPoowerPoint interview questions and answersTotal 50 questionsData Structures interview questions and answersTotal 49 questionsMicrosoft Excel interview questions and answersTotal 37 questionsComputer Networking interview questions and answersTotal 65 questionsComputer Basics interview questions and answersTotal 62 questionsGenerative AI interview questions and answersTotal 30 questionsNumPy interview questions and answersTotal 30 questionsPython interview questions and answersTotal 106 questionsPython Pandas interview questions and answersTotal 48 questionsPython Matplotlib interview questions and answersTotal 30 questionsDjango interview questions and answersTotal 50 questionsPandas interview questions and answersTotal 30 questionsDeep Learning interview questions and answersTotal 29 questionsFlask interview questions and answersTotal 40 questionsPySpark interview questions and answersTotal 30 questionsPyTorch interview questions and answersTotal 25 questionsData Science interview questions and answersTotal 23 questionsSciPy interview questions and answersTotal 30 questionsData Warehouse interview questions and answersTotal 20 questionsSQL interview questions and answersTotal 152 questionsIBM DB2 interview questions and answersTotal 40 questionsElasticsearch interview questions and answersTotal 61 questionsData Mining interview questions and answersTotal 30 questionsOracle interview questions and answersTotal 34 questionsMongoDB interview questions and answersTotal 27 questionsAWS DynamoDB interview questions and answersTotal 46 questionsEntity Framework interview questions and answersTotal 46 questionsRedis Cache interview questions and answersTotal 20 questionsMySQL interview questions and answersTotal 108 questionsData Modeling interview questions and answersTotal 30 questionsDBMS interview questions and answersTotal 73 questionsMariaDB interview questions and answersTotal 40 questionsApache Hive interview questions and answersTotal 30 questionsPostgreSQL interview questions and answersTotal 30 questionsSSIS interview questions and answersTotal 30 questionsTeradata interview questions and answersTotal 20 questionsSQL Query interview questions and answersTotal 70 questionsSQLite interview questions and answersTotal 53 questionsCassandra interview questions and answersTotal 25 questionsNeo4j interview questions and answersTotal 44 questionsMSSQL interview questions and answersTotal 50 questionsOrientDB interview questions and answersTotal 46 questionsVerilog interview questions and answersTotal 30 questionsVLSI interview questions and answersTotal 30 questionsSoftware Engineering interview questions and answersTotal 27 questionsMATLAB interview questions and answersTotal 25 questionsDigital Electronics interview questions and answersTotal 38 questionsCivil Engineering interview questions and answersTotal 30 questionsElectrical Machines interview questions and answersTotal 29 questionsData Engineer interview questions and answersTotal 30 questionsAutoCAD interview questions and answersTotal 30 questionsRobotics interview questions and answersTotal 28 questionsPower System interview questions and answersTotal 28 questionsElectrical Engineering interview questions and answersTotal 30 questionsSalesforce interview questions and answersTotal 57 questionsIBM DataStage interview questions and answersTotal 20 questionsTalend interview questions and answersTotal 34 questionsTIBCO interview questions and answersTotal 30 questionsInformatica interview questions and answersTotal 48 questionsOracle CXUnity interview questions and answersTotal 29 questionsWeb Services interview questions and answersTotal 10 questionsSalesforce Lightning interview questions and answersTotal 30 questionsIBM Integration Bus interview questions and answersTotal 30 questionsPower BI interview questions and answersTotal 24 questionsOIC interview questions and answersTotal 30 questionsDell Boomi interview questions and answersTotal 30 questionsWeb API interview questions and answersTotal 31 questionsJPA interview questions and answersTotal 41 questionsJava 8 interview questions and answersTotal 30 questionsHibernate interview questions and answersTotal 52 questionsJMS interview questions and answersTotal 64 questionsJSF interview questions and answersTotal 24 questionsJava 17 interview questions and answersTotal 20 questionsSpring Boot interview questions and answersTotal 50 questionsServlets interview questions and answersTotal 34 questionsKotlin interview questions and answersTotal 30 questionsEJB interview questions and answersTotal 80 questionsJava Beans interview questions and answersTotal 57 questionsJava Exception Handling interview questions and answersTotal 30 questionsJava 15 interview questions and answersTotal 16 questionsApache Wicket interview questions and answersTotal 26 questionsCore Java interview questions and answersTotal 306 questionsJava Multithreading interview questions and answersTotal 30 questionsLog4j interview questions and answersTotal 35 questionsJBoss interview questions and answersTotal 14 questionsJava Mail interview questions and answersTotal 27 questionsJava Applet interview questions and answersTotal 29 questionsGoogle Gson interview questions and answersTotal 8 questionsJava 21 interview questions and answersTotal 21 questionsApache Camel interview questions and answersTotal 20 questionsStruts interview questions and answersTotal 84 questionsRMI interview questions and answersTotal 31 questionsJava Support interview questions and answersTotal 30 questionsJAXB interview questions and answersTotal 18 questionsApache Tapestry interview questions and answersTotal 9 questionsJSP interview questions and answersTotal 49 questionsJava Concurrency interview questions and answersTotal 30 questionsJ2EE interview questions and answersTotal 25 questionsJUnit interview questions and answersTotal 24 questionsJava OOPs interview questions and answersTotal 30 questionsJava 11 interview questions and answersTotal 24 questionsJDBC interview questions and answersTotal 27 questionsJava Garbage Collection interview questions and answersTotal 30 questionsJava Design Patterns interview questions and answersTotal 15 questionsSpring Framework interview questions and answersTotal 53 questionsJava Swing interview questions and answersTotal 27 questionsSCCM interview questions and answersTotal 30 questionsTally interview questions and answersTotal 30 questionsPega interview questions and answersTotal 30 questionsITIL interview questions and answersTotal 25 questionsFinance interview questions and answersTotal 30 questionsJIRA interview questions and answersTotal 30 questionsSAP MM interview questions and answersTotal 30 questionsSAP ABAP interview questions and answersTotal 24 questionsMobile Computing interview questions and answersTotal 20 questionsXamarin interview questions and answersTotal 31 questionsiOS interview questions and answersTotal 52 questionsIonic interview questions and answersTotal 32 questionsAndroid interview questions and answersTotal 14 questionsTechnical Support interview questions and answersTotal 30 questionsMainframe interview questions and answersTotal 20 questionsHadoop interview questions and answersTotal 40 questionsBanking interview questions and answersTotal 20 questionsCheckpoint interview questions and answersTotal 20 questionsBlockchain interview questions and answersTotal 29 questionsSales interview questions and answersTotal 30 questionsNature interview questions and answersTotal 20 questionsChemistry interview questions and answersTotal 50 questionsDocker interview questions and answersTotal 30 questionsCollege Teachers interview questions and answersTotal 30 questionsSDLC interview questions and answersTotal 75 questionsCryptography interview questions and answersTotal 40 questionsRPA interview questions and answersTotal 26 questionsInterview Tips interview questions and answersTotal 30 questionsGIT interview questions and answersTotal 30 questionsBlue Prism interview questions and answersTotal 20 questionsMemcached interview questions and answersTotal 28 questionsSSB interview questions and answersTotal 30 questionsAlgorithm interview questions and answersTotal 50 questionsBusiness Analyst interview questions and answersTotal 40 questionsSplunk interview questions and answersTotal 30 questionsDevOps interview questions and answersTotal 45 questionsAccounting interview questions and answersTotal 30 questionsOSPF interview questions and answersTotal 30 questionsSqoop interview questions and answersTotal 30 questionsJSON interview questions and answersTotal 16 questionsAccounts Payable interview questions and answersTotal 30 questionsComputer Graphics interview questions and answersTotal 25 questionsIoT interview questions and answersTotal 30 questionsInsurance interview questions and answersTotal 30 questionsScrum Master interview questions and answersTotal 30 questionsActive Directory interview questions and answersTotal 30 questionsLaravel interview questions and answersTotal 30 questionsXML interview questions and answersTotal 25 questionsGraphQL interview questions and answersTotal 32 questionsBitcoin interview questions and answersTotal 30 questionsMicroservices interview questions and answersTotal 30 questionsApache Kafka interview questions and answersTotal 38 questionsTableau interview questions and answersTotal 20 questionsAdobe AEM interview questions and answersTotal 50 questionsKubernetes interview questions and answersTotal 30 questionsOOPs interview questions and answersTotal 30 questionsFashion Designer interview questions and answersTotal 20 questionsDesktop Support interview questions and answersTotal 30 questionsIAS interview questions and answersTotal 56 questionsPHP OOPs interview questions and answersTotal 30 questionsNursing interview questions and answersTotal 40 questionsLinked List interview questions and answersTotal 15 questionsDynamic Programming interview questions and answersTotal 30 questionsSharePoint interview questions and answersTotal 28 questionsCICS interview questions and answersTotal 30 questionsYoga Teachers Training interview questions and answersTotal 30 questionsSchool Teachers interview questions and answersTotal 25 questionsLanguage in C interview questions and answersTotal 80 questionsBehavioral interview questions and answersTotal 29 questionsFull-Stack Developer interview questions and answersTotal 60 questionsStatistics interview questions and answersTotal 30 questionsDigital Marketing interview questions and answersTotal 40 questionsApache Spark interview questions and answersTotal 24 questionsVISA interview questions and answersTotal 30 questionsIIS interview questions and answersTotal 30 questionsSystem Design interview questions and answersTotal 30 questionsSEO interview questions and answersTotal 51 questionsGoogle Analytics interview questions and answersTotal 30 questionsCloud Computing interview questions and answersTotal 42 questionsBPO interview questions and answersTotal 48 questionsANT interview questions and answersTotal 10 questionsAgile Methodology interview questions and answersTotal 30 questionsHR Questions interview questions and answersTotal 49 questionsREST API interview questions and answersTotal 52 questionsContent Writer interview questions and answersTotal 30 questionsSAS interview questions and answersTotal 24 questionsControl System interview questions and answersTotal 28 questionsShell Scripting interview questions and answersTotal 50 questionsNext.js interview questions and answersTotal 30 questionsKnockout JS interview questions and answersTotal 25 questionsTypeScript interview questions and answersTotal 38 questionsPowerShell interview questions and answersTotal 27 questionsTerraform interview questions and answersTotal 30 questionsJCL interview questions and answersTotal 20 questionsJavaScript interview questions and answersTotal 59 questionsAjax interview questions and answersTotal 58 questionsExpress.js interview questions and answersTotal 30 questionsAnsible interview questions and answersTotal 30 questionsES6 interview questions and answersTotal 30 questionsElectron.js interview questions and answersTotal 24 questionsNodeJS interview questions and answersTotal 30 questionsRxJS interview questions and answersTotal 29 questionsExtJS interview questions and answersTotal 50 questionsjQuery interview questions and answersTotal 22 questionsVue.js interview questions and answersTotal 30 questionsSvelte.js interview questions and answersTotal 30 questionsPII interview questions and answersTotal 30 questionsData Protection Act interview questions and answersTotal 20 questionsBGP interview questions and answersTotal 30 questionsEthical Hacking interview questions and answersTotal 40 questionsCyber Security interview questions and answersTotal 50 questionsUnix interview questions and answersTotal 105 questionsWeblogic interview questions and answersTotal 30 questionsTomcat interview questions and answersTotal 16 questionsGlassfish interview questions and answersTotal 8 questionsUbuntu interview questions and answersTotal 30 questionsLinux interview questions and answersTotal 43 questionsETL Testing interview questions and answersTotal 20 questionsCucumber interview questions and answersTotal 30 questionsQTP interview questions and answersTotal 44 questionsTestNG interview questions and answersTotal 38 questionsPostman interview questions and answersTotal 30 questionsSDET interview questions and answersTotal 30 questionsQuality Assurance interview questions and answersTotal 56 questionsSelenium interview questions and answersTotal 40 questionsKali Linux interview questions and answersTotal 29 questionsMobile Testing interview questions and answersTotal 30 questionsUiPath interview questions and answersTotal 38 questionsAPI Testing interview questions and answersTotal 30 questionsAppium interview questions and answersTotal 30 questionsAngular JS interview questions and answersTotal 21 questionsWeb Developer interview questions and answersTotal 50 questionsAngular 8 interview questions and answersTotal 32 questionsDojo interview questions and answersTotal 23 questionsSymfony interview questions and answersTotal 30 questionsGWT interview questions and answersTotal 27 questionsRuby On Rails interview questions and answersTotal 74 questionsCSS interview questions and answersTotal 74 questionsYii interview questions and answersTotal 30 questionsAngular interview questions and answersTotal 50 questionsPHP interview questions and answersTotal 27 questionsOracle JET(OJET) interview questions and answersTotal 54 questionsFrontend Developer interview questions and answersTotal 30 questionsZend Framework interview questions and answersTotal 24 questionsRichFaces interview questions and answersTotal 26 questionsHTML interview questions and answersTotal 27 questionsFlutter interview questions and answersTotal 25 questionsCakePHP interview questions and answersTotal 30 questionsReact interview questions and answersTotal 40 questionsReact Native interview questions and answersTotal 26 questions
Copyright © 2026, WithoutBook.