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

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Q1681. What are different Business Models supported by WCS ?

IBM WCS

Ans. B2C , B2B , Supply Chain , Extended Sites.

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Q1682. What are eSpots and How do we manage them ?

IBM WCS

Ans. eSpot is the mechanism in WCS to schedule and display dynamic content. Content management for these slots are done through Accelarator.

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Q1683. Explain concept of Hubs and Extended site stores ?

IBM WCS

Ans. Hub and Extended sites /stores are used in case of selling through partners and affiliates. Hub is the central site around which extended stores are created by/for the respective partner / affiliate. Store owner performs the extended site administrations whereas overall control over merchandise remains with the site.

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Q1684. What is B2C and B2B Business model ?

IBM WCS

Ans. B2C business deals with selling merchandise directly to consumers whereas B2B business deals with selling / coordination with other businesses ( partners , distributors , affiliates etc ) for selling merchandise.

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Q1685. Why can't we add Products while specifying Target Catalog entry in Promotions?

IBM WCS

Ans. Product refer to category of Items and hence can't be associated to a particular Stock keeping unit. Items can only be targeted while creating promotions.

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Q1686. What is SKU ?

IBM WCS

Ans. SKU is Stock keeping unit. Items are referred to as SKU as they are the narrowest identifier for which business needs to track quantity.

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Q1687. How do we set Auctions in WCS ?

IBM WCS

Ans. Through Accelerator.

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Q1688. Can we schedule auctions and promotions in WCS ?

IBM WCS

Ans. Yes

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Q1689. What are the different types of Auctions in WCS ?

IBM WCS

Ans. open cry, sealed bid, and dutch

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Q1690. What information is stored in CACHEIVL table and How does this help in caching ?

IBM WCS

Ans. This table records the changes to product or category information in the database. This is referred by WCS for invalidating dynacache.

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Q1691. What is reload interval and where it is defined ?

IBM WCS

Ans. reload interval or jsp caching interval is a parameter that indicates how frequently a JSP should be recompiled.

It is defined within

Stores.warWEB-INFibm-web-ext.xmi

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Q1692. What are the design patterns used in WCS ?

IBM WCS

Ans. MVC , Display Design and Command.

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Q1693. Who manages the Access control policies and How ?

IBM WCS

Ans. Site Administrator and through Org Admin Console.

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Q1694. What are the tables used for Access control ?

IBM WCS

Ans. ACPOLICY , ACPOLDESC , ACACTION , ACRELATION , ACRESREL , ACRESGRP

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Q1695. How Access control Policies are implemented in WCS ?

IBM WCS

Ans. There are three elements i.e Users ( Who want access ) , Actions ( What kind of Access ) and Resources ( Whose Access ). The relationship between resource and user is store in ACRELATION table and ACRESREL associate a resource and relationship.

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Q1696. How and Why Strings are interned in Java ?

Core Java

Ans. String class has a public method intern() that returns a canonical representation for the string object. String class privately maintains a pool of strings, where String literals are automatically interned.

these are automatically interned so as to have efficient String comparison using == operator instead of equals which is usually slower.

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Q1697. What is a certificate authority ?

Security

Ans. A trusted organization which issues public key certificates and provides identification to the bearer.

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Q1698. What is cascade or cascading delete ?

Process

Ans. A deletion that triggers another deletion

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Q1699. What is fulfillment center ?

ECommerce

Ans. Fulfillment center or Delivery Center is the store or warehouse from where the actual delivery of merchandise takes place.

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Q1700. What are callback methods ?

Core Java

Ans. Component methods called by the container to notify the component of the events

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Q1701. What is the difference between authentication and authorization ?

Authentication

Ans. Authentication is the process of verifying the identity and credentials of the user to authenticate him into the system.

whereas

Authorization is the process by which access to a segment , method or resource is determined.

Authorization is usually a step next to authentication.

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Q1702. What is archiving ?

Process

Ans. It's the process of preserving the state of an object and then restoring it.

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Q1703. What is an applet ?

Core Java

Ans. Applet is a J2EE component or a tiny application that gets executed in a widget engine ( like browser )

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Q1704. What is the difference between

File f = new File("homexyz.txt");

and

File f = File.createTempFile("xyz",".txt","home"); ?

Core Java

Ans. First will not create physical file in storage whereas the second will.

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Q1705. Can you name some of the Java frameworks in different domains ?

Frameworks

Ans. Web Framework - Spring , Struts, Play
Dependency Injection frameworks - Google Guice , PicoContainer and Dagger
ORM Framework - Hibernate
Big Data / ETL Frameworks - Apche Hadoop , Apache Crunch, Apache Spark.
View Frameworks - JSF , Apache Wicket,jtwig.
Java Gui Frameworks - SWT , AWT, JavaFX
Testing - Junit, Mockito, PowerMock, EasyMock, JMock, JMockit
Rest Web services - Jersey , Restlet , RestX, RestEasy ,Restfulie

Here is the big list for reference - http://javasearch.buggybread.com/home2.php?keyword=

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Q1706. What are the benefits of creating immutable objects ?

Core Java

Ans. 1. Security and Safety - They can be shared across multiple threads as they are thread safe. Moreover, it protects then from bad state due to interception by the other code segment. One such problem due to mutability and access by alternate code segment could be the change of hash code and then the impact on its search with hash collections.

2. Reuse - In some cases they can be reused as only one copy would exist and hence it can be relied upon. For example - String Pool

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Q1707. What are some advantages of Scala ?

Scala

Ans. Scala code is more concise and hence easy to read and maintain. It supports all features of functional programming and provide a pure object oriented way of application creation. It is ideal for creating all scales of applications. It is inter operable with Java code and hence can import / use Java libraries and frameworks.

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Q1708. Does Scala code compile to be Java Byte Code ?

Scala

Ans. Yes, that's the reason Scala code is inter operable with Java and they run smoothly with each other in JVM.

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Q1709. What is Scala ?

Scala

Ans. Scala is a general purpose programming language that runs on JVM. Its completely inter operable with Java, purely object oriented and has full support for functional programming and a strong static type system.

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Q1710. What are the similarities and differences between Scala and Java ?

Scala

Ans. Similarities - Both and Object Oriented and Statically typed languages that runs on JVM.

Difference - Unlike Java, Scala is a Pure Object Oriented language as it doesn't use primitives and static variables.Unlike Java 8 which supports some functional programming concepts, Scala provides support for all functional programming concepts. Java 8 does not support Pattern Matching, Function Currying etc

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