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

Interview Questions and Answers - Order By Newest

Q91. why should one we use 32 bit system instead of 64 bit?

Ans. Performance of a system doesn't solely rely on size of processor or it's communication size. It should also be compatible with other resources like memory, storage etc. Moreover it makes no sense to have 64 bit systems when there is hardly any software than can run on 64 bit system.

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Q92. Difference between Singleton and Factory Design Pattern ?

Design

Ans. Both are creational design patterns but singleton facilitates in creation and reuse of single object whereas Factory deals with creation of multiple objects.

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Q93. Describe Marketing subsystem and What WCS components are part of this system ?

IBM WCS

Ans. The Marketing subsystem is a component of the WebSphere Commerce Server, and provides numerous marketing concepts to your site, designed to increase brand awareness, and to attract and retain customers. Components of the marketing subsystem provide functionality to create marketing campaigns, including customer segments and advertising; and e-mail activities.

Various components are -

1. Promotions
2. Auctions
3. eSpots
4. e Mail Campaigns
5. Hubs and Extended sites for affiliates

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Q94. Describe Catalog subsystem and the tables used in WCS for managing this ?

IBM WCS

Ans. The catalog subsystem or Catalog Management provides online catalog navigation, partitioning, categorization, and associations. In addition, the catalog subsystem includes support for personalized interest lists and custom catalog display pages. The catalog subsystem contains all logic and data relevant to an online catalog, including catalog groups (or categories), catalog entries, and any associations or relationships among them.

Tables used for Catalog subsystem

1. CATENTRY
2. CATENTREL

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Q95. What are the core OOPs concepts ?

Core Java

Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance

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Q96. 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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Q97. Difference between Mutex and Semaphore?

Operating System

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Q98. Explain process life cycle.

Operating System

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Q99. What is an Operating system or OS ?

Operating System

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Q100. What is thrashing?

Operating System

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Q101. 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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Q102. What is JVM ?

Core Java

Ans. JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed.JVMs are available for many hardware and software platforms (i.e. JVM is platform dependent).Runtime Instance Whenever you write java command on the command prompt to run the java class, an instance of JVM is createdThe JVM performs following operation:Loads codeVerifies codeExecutes codeProvides runtime environment

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Q103. Write a class and override the equals and hashcode method ?

Core Java

Ans. class Student
{
///
///
///
private int id;
private String name;

///
///
///
public Student(int id, String name)
{
this.name = name;
this.id = id;

}// Student

///
///
///
public int getId()
{
return id;

}// getId

///
///
///
public void setId(int id)
{
this.id = id;

}// setId

///
///
///
public String getName()
{
return name;

}// getName

///
///
///
public void setName(String name)
{
this.name = name;

}// setName

@Override
public boolean equals(Object obj)
{
if (obj == null) return false;
if (!(obj instanceof Student))
return false;
if (obj == this)
return true;

return this.getId() == ((Student) obj).getId();

}// equals

///
///
///
@Override
public int hashCode()
{
return this.getId();

}// hashCode

}// Student

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Q104. What are the four situations that are required for deadlock to happen ?

Operating System

Ans. mutual exclusion i.e the resource is not shareable and hence a process should have exclusive access to it at a particular time

Hold and Wait i.e the process doesn't release all existing resources held by it before requesting for another one.

No preemption i.e noone can forcefully release a resource held by another process and the process should voluntarily release the resource held by it.

Circular Wait - For ex, P1 is waiting on resource to be released by P2, P2 is waiting on resource to be released by P3 and P3 is waiting on the resource to be released by P1

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Q105. What is Livelock in relation to deadlock ?

Operating System

Ans. Livelock is when two threads or processes get deadlocked because they try to perform the same action to come out of a potential deadlock.

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Q106. What is the difference between CountingSemaphore and a CountDownLatch?

Operating System

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Q107. What is a host file ?

Operating System

Ans. It's an operating system file that maps IP address to host names. The hosts file assists the OS in addressing networked components and serves the function of translating human friendly hostnames into numeric protocol addresses, called IP addresses, that identify and locate a host in an IP network.

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Q108. What are the examples of immutable objects in Java ?

Core Java

Ans. Following Classes in Java SE creates immutable objects

String class
Wrapper Classes like Integer, Float etc.
StackTraceElement
Most Enum classes
File Class
Locale Class

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Q109. Can you give real time examples of thread or where thread are actually used ?

Core Java

Ans. Games are very good examples of threading.You can use multiple objects in games like cars, motor bikes, animals, people etc. All these objects are nothing but just threads that run your game application.

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Very frequently asked. Usually among very first few questions.

Q110. Define encapsulation in Java ?

Core Java

Ans. Encapsulation is a feature of OOP's that binds the data and it's associated methods together as a single unit and facilitate protection and data hiding by providing minimal interface to outside. For example - member variables are declared private and are accessed through public methods. Moreover we have private methods that can only be used internally and hence providing minimal interface to outside class through use of public methods.

Sample Code for encapsulation

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Q111. Solve the producer and consumer problem

Operating System

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Q112. Explain OOps concepts.

Core Java

Ans. There are four main OOP concepts in Java. These are:

Abstraction. Abstraction means using simple things to represent complexity. We all know how to turn the TV on, but we don?t need to know how it works in order to enjoy it. In Java, abstraction means simple things like objects, classes, and variables represent more complex underlying code and data. This is important because it lets avoid repeating the same work multiple times.

Encapsulation. This is the practice of keeping fields within a class private, then providing access to them via public methods. It?s a protective barrier that keeps the data and code safe within the class itself. This way, we can re-use objects like code components or variables without allowing open access to the data system-wide.

Inheritance. This is a special feature of Object Oriented Programming in Java. It lets programmers create new classes that share some of the attributes of existing classes. This lets us build on previous work without reinventing the wheel.

Polymorphism. This Java OOP concept lets programmers use the same word to mean different things in different contexts. One form of polymorphism in Java is method overloading. That?s when different meanings are implied by the code itself. The other form is method overriding. That?s when the different meanings are implied by the values of the supplied variables. See more on this below.

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Q113. How to Create Cron Job in Hybris e-commerce suite

Hybris

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Q114. Why do you want to leave your current job ?

General

Ans. The most effective and acceptable reasons for leaving your current job should be positive e.g. moving forward in your life or career

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Q115. What methodology and technology stack do you use ?

General

Ans. [Open Ended Answer]

Possible Answer - We are using Agile. We have daily standups, Bi weekly Backlog Grooming , Planning and Retrospective, We have a 2 week sprint and We use Jira for Scrum Management. We are using Java 8, Spring Boot, JSF , Apache Kafka , Soap as well as Rest Services.

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Q116. What is optimistic and pessimistic locking ?

Operating System

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Q117. Difference between sleep() and Wait()

Operating System

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Q118. Write code to sort an array.

Algorithm

Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/

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Q119. What is OSGI ?

OSGI

Ans. OSGI is open service gateway initiative, its used as java framework for developing and deploying the modular softwares.

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Q120. What sets you apart from other developers ?

or

What are the distinguished qualities you have ?

General

Ans. https://blog.timesunion.com/careers/the-10-most-important-personality-traits-for-career-success/633/

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