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Interview Questions and Answers for 'Tieto' - 12 question(s) found - Order By Newest

Frequently asked question in companies using Hibernate.
  Q1. What is Lazy Initialization in Hibernate ?Hibernate
Admin
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Ans. It's a feature to lazily initialize dependencies , relationship and associations from the Database. Any related references marked as @OneToMany or @ManyToMany are loaded lazily i.e when they are accessed and not when the parent is loaded.

  Sample Code for Lazy Initialization

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   Like      Discuss      Correct / Improve     hibernate   lazy loading hibernate   lazy initialization hibernate   architecture     overstock.com  BridgePoint Technologies  Medgate  Dex Media  Diversant  Tieto  Oracle  Bank of America Merrill LYNCH  NEC Japan  HCL Technologies  Deloitte  Accenture  Infosys  Tata Consultancy (TCS)  Luxoft  Nvidia      Basic        frequent

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 Q2. Can constructors be synchronized in Java ?Core Java
Anonymous
Ans. No. Java doesn't allow multi thread access to object constructors so synchronization is not even needed.

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   Like      Discuss      Correct / Improve     synchronization   synchronize   constructor   java   multithreading   yes-no   advanced     Tieto      expert        rare


  Q3. 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     Computer Sciences Corporation (CSC) India   Tieto  Uproar  Priceline.com  HCL Technologies  Cognizant (CTS)  Hewlett Packard (HP)  Mphasis  Infosys Technologies  Global Logic  Microsoft      basic        frequent

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Very frequently asked.Usually among first few questions.
  Q4. What is MVC ? Design
Anonymous
Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application

1. Controller receives the requests and handles overall control of the request
2. Model holds majority of the Business logic, and
3. View comprise of the view objects and GUI component

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 Q5. Difference between Serialization and Deserialization ?Core Java
Anonymous
Ans. Serialization is the process of writing the state of an object to a byte stream. Deserialization is the process of restoring these objects.

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   Like      Discuss      Correct / Improve     java   oops   serialization   deserialization     Priceline.com   Tieto      basic        frequent

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Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions.
  Q6. What is rule regarding overriding equals and hashCode method ?Core Java
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info@buggybread.com
Ans. A Class must override the hashCode method if its overriding the equals method.

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All these acronyms JDK,JRE,JVM etc are very frequently asked.
 Q7. Difference between JDK and JRE ?Core Java2016-06-11 11:35:18

Ans. JRE or Java Runtime Environment is the Java Virtual Machine on which class files are executed. It includes borwser plugins that facilitates execution of class files in browsers.

JDK or Java Development Kit includes JRE , compiler and development tools.

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   Like      Discuss      Correct / Improve     JDK  JRE  JDK vs JRE  Difference between     Cognizant (CTS)  Aspire Infinite Solutions  Infoview Technologies   Tieto      basic        frequent


 Q8. What is serialVersionUID ?Core Java2016-12-20 17:26:52

Ans. Everytime an object is serialized the java serialization mechanism automatically computes a hash value by passing the meta information for the class. This id is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization

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   Like      Discuss      Correct / Improve     serialVersionUID  serialization     Tieto  Priceline.com  Nagarro      expert        rare


 Q9. What is the difference between following code segments

1.

try {
for(int i=0;i<100;i++){
calculate(i);
}
} catch (Exception ex) {
System.out.println("Error while processing")
}

and

2.

for(int i=0;i<100;i++){
try {
calculate(i);
} catch (Exception ex) {
System.out.println("Error while processing")
}
}
Core Java2016-12-29 15:42:10

Ans. In first case the whole loop will terminate as soon as any exception happens in the method calculate ( assuming calculate method is not handling its exception and those are thrown back at the calling method )

In Second case exception will be caught for individual iteration and hence it wont break the loop and will continue for the next iteration.

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   Like      Discuss      Correct / Improve     exception handling  try catch     Tieto



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 Q10. Explain your experience with Java, spring and web services?2017-01-10 10:40:19

 This question was recently asked at 'Tieto'.This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve          Tieto


 Q11. Can a constructor throw an exception ?Core Java2017-01-10 10:42:21

Ans. Yes

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   Like      Discuss      Correct / Improve          Tieto


 Q12. Can constructor be synchronized in Java ?Core Java2017-01-10 10:43:19

Ans. No, constructors can not be synchronized in Java. In fact using the keyword synchronized with a constructor results in compilation error.

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   Like      Discuss      Correct / Improve          Tieto      expert




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