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

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.

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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.

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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

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Difference between == and .equals() ?

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What is the difference between final, finally and finalize() ?

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