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Interview Questions and Answers for 'Sapient' - 11 question(s) found - Order By Newest

 Q1. Can we have multiple main methods in a single class ?Core Java2017-01-12 11:00:02

Ans. We can overload the main method by specifying different argument types. For example -

2 main methods with different arguments is perfectly legal

public static void main();
public static void main(String[] args);

The following are not legal as compiler will complain of duplicate methods

public static void main(String[] args);
public static void main(String[] args);

Even The following are not legal as we cannot overload on return types

public static String main(String[] args);
public static void main(String[] args);

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   Like      Discuss      Correct / Improve     main method     HCL Technologies  SapientNitro


Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
  Q2. 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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Try 1 Question(s) Test


 Q3. Can we extend an Enum ?Core Java
Admin
info@buggybread.com
Ans. No. Enums are final by design.

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   Like      Discuss      Correct / Improve     java   enums   inheritance   yes-no     Sapient      intermediate


 Q4. What are some alternates to keeping Audit Tables ?Database2016-07-14 14:24:37

Ans. Audit Tables generally stores Raw information to be reviewed in case of problems or determining impact. If Database space is an issue , and the audit information is rarely retrieved, one design could be to use compressed file system.

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   Like      Discuss      Correct / Improve     databases   audit tables   raw transaction information storage     Sapient


 Q5. What are the benefits of Enums ?Core Java2016-09-07 09:05:01

Ans. Enums in Java are used to declare predefined objects and then reuse them. they offer many benefits

1. Enum instance are type safe and thread safe.

2. Enum instances are singleton and hence reused.

3. If we use Enums with Switch , It makes sure that the passed argument is either of its instance and hence provides a safeguard.

4. If we use Enum with Sorted Collections we can sort the elements with a predefined priorities ( as per constant declaration in enum )

5. We can use Enum as a Factory by defining its constructor.

6. We can store related constant data within enum. For example - If we know the values for the map upfront, we can alternatively use an enum.

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   Like      Discuss      Correct / Improve          Sapient  HCL Technologies  Tata Consultancy (TCS)  Cognizant (CTS)  Accenture


 Q6. What is a Test Dependency Scope in Maven ?Maven2016-11-14 10:51:53

Ans. This scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases. This scope is not transitive.

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   Like      Discuss      Correct / Improve     maven     Sapient  General Electric (GE)


 Q7. What is Dirty read in Database Transactions ?Database2016-11-14 13:11:55

Ans. A dirty read occurs when a transaction is allowed to read data from a row that has been modified by another running transaction but not yet committed.

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   Like      Discuss      Correct / Improve     database transaction     Credit Agricole  Cassiopae  Infosys  Goldman Sachs  ISN Software  ProKarma  Sapient  Scotiabank


  Q8. What is database Normalization ?Database2017-01-09 12:00:02

Ans. https://en.wikipedia.org/wiki/Database_normalization

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 Q9. What is a factory design pattern ?Design2017-01-09 13:21:43

Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object.

So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object.

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   Like      Discuss      Correct / Improve     design pattern  factory design pattern     EPAM  EMC  TMP Worldwide  Sapient  Ernst & Young (EY)   ThyssenKrupp Materials  Wipro  Scotiabank  Hewlett Packard (HP)



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 Q10. Can an application have multiple main methods within different classes ? If yes, How will the app decide which one to be executed ?Core Java2017-01-12 10:56:40

Ans. Yes we can have a main method with string[] argument in every class of an application. When we execute an app we specify the starting point i.e the class that will get the control first and hence main method of that class gets executed.

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

   Like      Discuss      Correct / Improve     main method     HCL Technologies  Aspire Systems  SapientNitro


Usually asked to entry level software developers.
  Q11. Write a program to swap two variables without using thirdCore Java2017-01-19 15:38:34

Ans. public static void main(String[] args) {
   int num1 = 1;   
   int num2 = 2;
   num1 = num1^num2;
   num2 = num1^num2;
   num1 = num1^num2;
   System.out.print("num1 = " + num1 +", num2 = "+num2);
}

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