Core java - Interview Questions and Answers for 'Equator business solutions' | Search Interview Question

Core java - Interview Questions and Answers for 'Equator business solutions' - 3 question(s) found - Order By Newest

Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.

Q1. Differences between abstract class and interface ?

Core Java

Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

A class can extend single abstract class whereas it can implement multiple interfaces.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java classes abstract class interfaces abstract class vs interface abstract classes vs interfaces Asked in 82 Companies basic frequent}

Related Questions

What are the different uses of Interfaces in Java ?

Why can't we have diamond problem with interfaces ?

Why do we need Thread class even in case we execute thread using runnable interface ?

What is the difference between List, Set and Map ?

or

What are the different Java Collections Interfaces ?

What are Marker Interfaces ? Name few Java marker interfaces ?

Can we declare interface methods as private ?

What is comparator interface used for ?

What is the use of runnable interface if we can always create a new thread using Thread class ?

Which of the following doesn't extend Collection interface ?

Q2. What are the design considerations while making a choice between using interface and abstract class ?

Core Java

Ans. Keep it as a Abstract Class if its a "Is a" Relationsship and should do subset/all of the functionality. Keep it as Interface if its a "Should Do" relationship.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops abstract classes interfaces advanced Asked in 3 Companies}

Related Questions

Differences between abstract class and interface ?

What are the different uses of Interfaces in Java ?

Why can't we have diamond problem with interfaces ?

Why do we need Thread class even in case we execute thread using runnable interface ?

What is the difference between List, Set and Map ?

or

What are the different Java Collections Interfaces ?

What are Marker Interfaces ? Name few Java marker interfaces ?

Can we declare interface methods as private ?

What is comparator interface used for ?

What is the use of runnable interface if we can always create a new thread using Thread class ?

Which of the following doesn't extend Collection interface ?

Q3. Where to use interface and abstract class ?

Core Java

^{This question was recently asked at 'Exterro,Equator Business Solutions'.This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Asked in 2 Companies}

Related Questions

Difference between == and .equals() ?

Why is String immutable in Java ?

Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?

What are the difference between composition and inheritance in Java?

What is a Lambda Expression ? What's its use ?

Does garbage collection guarantee that a program will not run out of memory?

Why Char array is preferred over String for storing password?

Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs

What are different ways to create String Object? Explain.

What is the difference between Encapsulation and Abstraction?

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.