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Interview Questions and Answers for 'Computer sciences corporation (csc)' - 8 question(s) found - Order By Newest

Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
  Q1. Difference between Overloading and Overriding ?Core Java
Anonymous
Ans. Overloading - Similar Signature but different definition , like function overloading.

Overriding - Overriding the Definition of base class in the derived class.

  Sample Code for overloading

  Sample Code for overriding

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   Like         Discuss         Correct / Improve     java   oops   overloading   overriding   oops concepts   basic interview question     Asked in 82 Companies      basic        frequent

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  Q2. What is Serialization ? Why do we need it ?Core Java
Anonymous
Ans. Storing the state of an object in a file or other medium is called serialization.

Classes can communicate only if they are built together ( as they need Byte code for communication ). What if we need to enable communication between different applications ( i.e they have been built independently or even they reside at different locations ), We need a mechanism that will transfer the Bean state to a Medium than can be transferred to the receiving application.

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   Like         Discuss         Correct / Improve     java   oops   serialization     Asked in 18 Companies      basic        frequent

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Very frequently asked in phone and walk in interviews.
  Q3. What are Marker Interfaces ? Name few Java marker interfaces ?Core Java
Anonymous
Ans. These are the interfaces which have no declared methods.Serializable and cloneable are marker interfaces.

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   Like         Discuss         Correct / Improve     java   oops   interfaces   marker interface   serializable   clonable     Asked in 21 Companies      intermediate        frequent

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 Q4. Can we call the garbage collector explicitly ?Core Java
Admin
info@buggybread.com
Ans. Yes, We can call garbage collector directly but it doesn't guarantees that the gc will start executing immediately. This gc( ) method appears in both Runtime and System classes of java.lang package.

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   Like         Discuss         Correct / Improve     java   garbage collection   java memory management   jvm   gc   yes no     Asked in 4 Companies      expert

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 Q5. Explain Inner Classes ?Core Java
Admin
info@buggybread.com
Ans. The accessibility (public, protected, etc.) of the inner class is defined by the outer class.

Just like top-level classes, an inner class can extend a class or can implement interfaces.

Similarly, an inner class can be extended by other classes, and an inner interface can be implemented or extended by other classes or interfaces.

An inner class can be declared final or abstract.Inner classes can have inner classes, but you will have a hard time reading or understanding such complex nesting of classes.

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   Like         Discuss         Correct / Improve     java   oops   classes   inner classes     Asked in 2 Companies      Basic        frequent

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 Q6. What is a BlockingQueue?Data Structures
admin
info@buggybread.com
Ans. BlockingQueue is a Queue that supports operations that wait for the queue to become non-empty when retrieving and removing an element, and wait for space to become available in the queue when adding an element.

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   Like         Discuss         Correct / Improve     blockingqueue   collections   java   concurrent collections     Asked in 10 Companies


 Q7. With a Table employee having columns Id,Name,ManagerEmployeeId, Write a SQL to find the Manager with maximum number of employees ?Database2016-12-21 09:44:31

Ans. Select Name from EMPLOYEE where ID in (Select ManagerEmployeeId from EMPLOYEE
Group By ManagerEmployeeId
order by count(Id)
LIMIT 1)

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   Like         Discuss         Correct / Improve     database  sql     Asked in 1 Companies


 Q8. Which environment variables do we need to set in order to run Java programs?Core Java2017-01-12 10:55:08

Ans. PATH, CLASSPATH and JAVA_HOME

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   Like         Discuss         Correct / Improve     environment variables  path  classpath  java_home     Asked in 3 Companies      basic        frequent




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Computer sciences corporation (csc): There were standard java uqestions .need some ... Anonymous