Interview Questions and Answers for 'C' | Search Interview Question

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Q1561. what is the repository structure in svn ?

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Q1562. 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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Q1563. 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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Q1564. 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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Q1565. 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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Q1566. Do you like Native SQL Apis like JDBC or JPA / Hibernate ?

Hibernate

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Q1567. 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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Q1568. 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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Q1569. 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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Q1570. What are the daily activities of build and release engineer ?

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Q1571. 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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Q1572. 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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Q1573. Name few structural Design Patterns ?

Design

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

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Q1574. Name few creational design patterns ?

Design

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

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Q1575. 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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Q1576. Design a Passport Office system

Design

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Q1577. 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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Q1578. 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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Q1579. 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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Q1580. What are the core OOPs concepts ?

Core Java

Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance

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Frequently asked Spring interview question.

Q1581. What are the components of Spring framework ?

Spring

Ans. Core: [Core, Bean, Context, Expression Language]

Web: [Web, Portlet, Servlet, etc]

Data Access [JMS, JDBC, etc]

AOP, Aspect

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Q1582. What are the methods to connect to database in Java ?

Database

Ans. JDBC ( Java Database Connectivity ),ODBC (Open Database Connectivity), Hibernate, JPA ( Java Persistence API ), JOOQ,MyBatis

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Q1583. How would you do an object oriented design on animals in a zoo ?

Design

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Q1584. Write a method / program that will determine if the parenthesis are balanced in a given string.

Core Java

Ans. https://www.geeksforgeeks.org/check-for-balanced-parentheses-in-an-expression/

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Q1585. Why is it important to close files and streams ?

Core Java

Ans. Optimizing Resource utilization. When you open a file using any programming language , that is actually a request to operating system to access the file. When such a request is made , resources are allocated by the OS. When you gracefully close those files, those resources are set free.

In Java if you don’t close the streams and files, Garbage collection identifies the open files which have lost the reference and hence will close them.

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Q1586. What is the parent child relationship in Maven ?

Maven

Ans. Maven provides a facility to have a structure of inheritance relationship between modules / projects through parent tag in POM file. When we try building the parent project , all its child modules are built first in the order specified in the parent POM file.

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Q1587. What is the difference between && and & in Java ?

Core Java

Ans. && is a Logical whereas & is a bitwise operator

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Q1588. Why don't Java objects have destructors ?

Core Java

Ans. Java manages memory using built-in garbage collector

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Q1589. Write a Java program to print 10 random numbers between 1 to 100?

Core Java

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Q1590. Ho do you share / transfer variables between JSP pages ?

Java EE

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