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Q1381. How do threads share information ?

Core Java

Ans. Through common memory area.

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Q1382. Can the foreign key column have null values ?

Database

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Q1383. 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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Q1384. How Marker interfaces works internally ?

Core Java

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Q1385. what is the repository structure in svn ?

SVN

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Q1386. What are some of the Java Naming conventions ?

Core Java

Ans. 1. Class name should be a noun and should start with capital case character.

2. Interface Name should be an adjective and should start with capital case character.

3. Method and Variable names should follow lower camel case notation.

4. package name should be all lower case.

5. constant variables (static final) should be all capital case.

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Q1387. What is an execution engine within JVM ?

Core Java

Ans. Execution engine contains interpreter and JIT compiler, which covert byte code into machine code.

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Q1388. 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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Q1389. 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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Q1390. What was the worst problem you faced while working with Hibernate ?

Hibernate

Ans. Lazy Initialization exceptions

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Q1391. What are the disadvantages of Hibernate over native APIs ?

Hibernate

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Q1392. Do you like Native SQL Apis like JDBC or JPA / Hibernate ?

Hibernate

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Q1393. 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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Q1394. What does the following exception means

org.hibernate.LazyInitializationException: could not initialize proxy - no Session

Hibernate

Ans. The error states that Hibernate is not able to initialize proxy / dependent entity objects as there is no session or transaction present. Very likely we are trying to load the dependent entities lazily but the call to dependent object property is not wrapped within the session or transaction.

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Q1395. If we would like to load just the mapping id for the mapped entity in some cases and whole entity in some cases, because we would like to lazily initialize the dependent entity in some case and not load the entity at all in some case, how can we accomplish that.

For example -

Employee entity is mapped to department entity through department id. We want that when we load employee.getDepartment().getDepartmentId(), it shouldn't load the complete department object but just the Id.

Hibernate

Ans. a

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Q1396. If we would like to load just the mapping id for the mapped entity, how can we accomplish that.

For example -

Employee entity is mapped to department entity through department id. We want that when we load employee.getDepartment().getDepartmentId(), it shouldn't load the complete department object but just the Id.

Hibernate

Ans. We can use

@AccessType("property") for getDepartmentId() method within Department class in that case.

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Q1397. Can we have 2 entity fields mapped to the same column in Hibernate ?

Hibernate

Ans. No, it's not legal in hibernate. 1 column should be mapped to only one field in entity.

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Q1398. What is Amazon S3 ?

Amazon Web Services (AWS)

Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web.

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Q1399. What are the daily activities of build and release engineer ?

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Q1400. Where do you see yourself in next 5 years?

General

Ans. Sample Answers -

Getting better with upcoming technologies and be a Lead developer.

In accordance with the company, working as a permenant employee.

Be an associate architect.

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Q1401. What is Exception Wrapping ?

Ans. Exception wrapping is wrapping an exception object within another exception object and then throwing the outer exception.

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Q1402. Which is your favorite Design pattern, each in Creational , Structural and Behavioral and Why ?

Design

Ans. [Open Ended Answer]

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Q1403. Name few Behavioral Design Patterns ?

Design

Ans. Interpreter,Chain of Responsibility,Command,Iterator,Observer,Mediator,Memento

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Q1404. Name few structural Design Patterns ?

Design

Ans. Adapter,Bridge,Composite,Decorator,Facade,Flyweight,Proxy

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Q1405. Name few creational design patterns ?

Design

Ans. Factory,Abstract Factory,Singleton,Prototype and Builder

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Q1406. What access the variable gets if we don't provide any access specifier ?

Core Java

Ans. It gets the default access i.e package protected.

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Q1407. Design a Passport Office system

Design

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Q1408. What is cloning in GIT ?

GIT

Ans. Cloning is the process of making a copy. It could be creating local copy of another local repository or local copy of remote repository.

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Q1409. What is the difference between GIT Commit and Push ?

GIT

Ans. Git commit commit the changes to local repository whereas Push commits the changes to Remote repository.

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Q1410. How are the concept of Association related to Composition and Inheritance ?

Core Java

Ans. Composition and Inheritance are the different types of Associations for Classes.

Composition is a has-a association between classes.
Inheritance is a is-a association between classes.

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