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Interview Questions and Answers - Order By Rating

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 Q481. What is a mutator in Java?Core Java
Ans. Mutator is another name for setter methods, i.e the method allows for mutating the property of an object and eventually the state of the object.

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   Like         Discuss         Correct / Improve     setter method  mutator

 Q482. What are the core interfaces in Hibernate?Hibernate
Ans. Session,SessionFactory,Configuration,Transaction,query and Criteria

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   Like         Discuss         Correct / Improve     core interfaces of Hibernate     Asked in 1 Companies        frequent
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 Q483. Where the prepared Statement object creating - In Java application or DB ?Database
Ans. Prepared Statement objects are created and cached at database level.

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   Like         Discuss         Correct / Improve     Prepared statements     Asked in 1 Companies
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 Q484. What are the benefits of using prepared statements ? Does that benefit extend only if similar prepared statements are used within a application or it extends even with multiple applications having similar prepared statement ?Database
Ans. Prepared Statements helps in reuse of database execution plan which can be cached at Database level and hence helps achieving faster execution and performance. As cached ps objects are creating at Database level and not application level, the use and benefit extends across multiple applications.

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   Like         Discuss         Correct / Improve     Prepared statements  benefits of prepared statements     Asked in 1 Companies
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 Q485. What are the benefits of using Prepared statements ?Database
Ans. 1. Precompilation , DB-side caching and reuse of same execution plan leads to overall faster execution.

2. Automatic prevention of SQL injection attacks by escaping special characters

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   Like         Discuss         Correct / Improve     Prepared statements  benefits of prepared statements     Asked in 1 Companies
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 Q486. What is the use of Hibernate session.evict()?Hibernate
Ans. It is used to dissociate / disconnect a particular object from the session.

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   Like         Discuss         Correct / Improve     hibernate session evict  hibernate evict

 Q487. What is the use of Hibernate session.clear() ?Hibernate
Ans. It is used to clear the session and is used to dissociate disconnect all the objects from the session.

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 Q488. What is the difference between session.clear and session.evict ?Hibernate
Ans. session.clear clears all the objects from session whereas session.evict is used for evicting a particular entity.

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   Like         Discuss         Correct / Improve     hibernate session clear  hibernate evict
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 Q489. How can we make sure that Hibernate doesn't update the entity changes to DB or how to keep the entity detached ?Hibernate
Ans. If it's only a read only transaction, we can wrap the get / load call in read only transaction.

If we want it to be application wide, we an set the flush mode accordingly or else we can evict the entity object to remove them from session.

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 Q490. Does Hibernate synchronize entity with the database automatically i.e any change to entity gets updated in DB ?Hibernate
Ans. Yes, the feature is there but can be override with changing the Flush Mode.

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 Q491. What is Priority inversion ?Operating System
Ans. Priority inversion is a problematic scenario in scheduling in which a high priority task is indirectly preempted by a lower priority task effectively inverting the relative priorities of the two tasks.

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   Like         Discuss         Correct / Improve          Asked in 5 Companies

 Q492. What is priority inversion inheritance method?
Ans. https://en.wikipedia.org/wiki/Priority_inversion

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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q493. What data structure will you use if we have to search an element in million of elements ?Data Structure
 This question was recently asked at 'Microsoft'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Search     Asked in 1 Companies

 Q494. What is thrashing?Operating System
 This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.


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 Q495. What is an Operating system or OS ?Operating System
 This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.


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 Q496. Explain process life cycle.Operating System
 This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.


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 Q497. Difference between Virtual Memory and Demand Paging?Operating System
 This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Virtual Memory vs Demand Paging     Asked in 1 Companies

 Q498. Difference between Mutex and Semaphore? Operating System
 This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Mutex vs Semaphore     Asked in 1 Companies

 Q499. how many reducer task runs on a hadoop cluster ?BigData
Ans. Generally one reducer runs for all mappers, but it can be increased as per requirements.

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   Like         Discuss         Correct / Improve     Hadoop  BigData     Asked in 1 Companies

 Q500. What is ACL ?Operating System
Ans. Access Control List or ACL is the list of permissions attached to an object in the File System.

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   Like         Discuss         Correct / Improve     acl  file system  file security  object security  operating system

 Q501. What is the precedence of operators in Java ?Core Java
Ans. http://introcs.cs.princeton.edu/java/11precedence/

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   Like         Discuss         Correct / Improve     operators  operator precedence      basic

 Q502. How do threads share information ?Core Java
Ans. Through common memory area.

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   Like         Discuss         Correct / Improve     threads     Asked in 1 Companies

 Q503. Can the foreign key column have null values ?Database
 This question was recently asked at 'Volkswagen It services'.This question is still unanswered. Can you please provide an answer.


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 Q504. Write program to create a linked list and perform different operations on it.Algorithm
Ans. import java.util.*;
class LinkedListSolution{
protected LinkedList list;
public LinkedListSolution(){
list = new LinkedList();
}
public Object pop() throws NoSuchElementException{
if(list.isEmpty())
throw new NoSuchElementException();
else
return list.removeFirst();
}
public void push(Object obj){
list.addFirst(obj);
}
public Object peek() throws NoSuchElementException{
if(list.isEmpty())
throw new NoSuchElementException();
else
return list.getFirst();
}
public boolean isEmpty(){
return list.isEmpty();
}
public String toString(){
return list.toString();
}
}
class TestStack{
public static void main(String args[]){
LinkedListSolution s = new LinkedListSolution();
s.push("First");
s.push("Second");
s.push("Third");
System.out.println("Top: " s.peek());
s.push("Fourth");
while(!(s.isEmpty()))
System.out.println(s.pop());
}
}

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   Like         Discuss         Correct / Improve     Linkedlist  data structures  algorithm     Asked in 2 Companies      basic

 Q505. How to create list that will sort it's elements dynamically?Algorithm
Ans. Override the behavior of collection class to sort the list upon each element addition. Though it's not recommended as list are sorting heavy data structures.

List<MyType> list = new ArrayList<MyType>() {
public boolean add(MyType mt) {
super.add(mt);
Collections.sort(list, comparator);
return true;
}
};

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   Like         Discuss         Correct / Improve          Asked in 1 Companies      intermediate

 Q506. Is it advisable to keep session or transaction open for long time just to avoid LazyInitializationException ?Hibernate
Ans. No. It's a resource and performance overhead.

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   Like         Discuss         Correct / Improve     LazyInitializationException  Lazy Loading

 Q507. What was the worst problem you faced while working with Hibernate ?Hibernate
Ans. Lazy Initialization exceptions

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 Q508. What are the disadvantages of Hibernate over native APIs ?Hibernate
 This question is still unanswered. Can you please provide an answer.


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 Q509. Do you like Native SQL Apis like JDBC or JPA / Hibernate ?Hibernate
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     JDBC vs JPA  JDBC vs Hibernate

 Q510. If you are given choice to avoid LazyInitializationException using any of the following measures, which are the ones you will choose and why ?

1. Set lazy=false in the hibernate config file.
2. Set @Basic(fetch=FetchType.EAGER) at the mapping.
3. Make sure that we are accessing the dependent objects before closing the session.
4. Force initialization using Hibernate.initialize		Hibernate
Ans. First resolution is a big No as it conveys no lazy loading in complete app. even second is advocating the same but for a particular mapping.

third one is most appropriate if loading and dependent entity property access is closer to each other in code and can be accomplished.

I don't mind using 4th too.

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   Like         Discuss         Correct / Improve     lazy loading  lazy initialization  LazyInitializationException

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