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Core java - Interview Questions and Answers for 'Global healthcare' - 2 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
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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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Related Questions

 What are the different uses of Interfaces in Java ?
 Why can't we have diamond problem with interfaces ?
  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 ?
  Why do we need Thread class even in case we execute thread using runnable interface ?
  Which of the following doesn't extend Collection interface ?
 If an Abstract class has only abstract methods, What's the difference between such a class and an interface ?
  What is an API ( Application Programming Interface ) ?
  Can we declare interface methods as private ?


  Q2. What is the use of Transient Keyword ?Core Java
Anonymous
Ans. It in Java is used to indicate that a field should not be serialized.

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Related Questions

  Which of the following combination of keywords is illegal in Java ?

a. static and transient
b. transient and final
c. static and synchronized
d. abstract and final
  Which keyword is used to provide explicit access of a code block to single thread ?

a. Transient
b. Final
c. Explicit
d. Synchronized
 Can we declare static variables as transient ?
  What are transient variables in java?
  Which of the following is true ?
  Variables of an interface are intrinsically ...

a. transient
b. final
c. public
d. static




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