Interview Question and Answers | Search Coding Interview Questions

Interview Questions and Answers - Order By Newest

Q1541. Write a Program to print pattern like following

*_**_***_****_*****_***************

Ans. public class BuggyBread {
   public static void main(String args[]) {
      for(int x=1;x<=5;x++){
         for(int y=1;y<=x;y++){
            System.out.print("*");
         }

         System.out.print("_");
      }

      for(int x=5;x>=1;x--){
         for(int y=1;y<=x;y++){
            System.out.print("*");
         }

         System.out.print("");
      }
   }
}

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Q1542. Write a Program to print numbers like following

1
12
123
1234
12345

Core Java

Ans. public class BuggyBread {
   public static void main(String args[]) {
      for(int x=1;x<=5;x++){
         for(int y=1;y<=x;y++){
            System.out.print(y);
         }

         System.out.println(" ");
      }
   }
}

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Q1543. Write a Program to print numbers like following

1
22
333
4444
55555

Core Java

Ans. public class BuggyBread {
   public static void main(String args[]) {
      for(int x=1;x<=5;x++){
         for(int y=1;y<=x;y++){
            System.out.print(x);
         }

         System.out.println(" ");
      }
   }
}

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Q1544. Difference between concurrentHashMap and HashTable ?

Core Java

Ans. HashTable locks the complete collection to provide synchronization whereas ConcurrentHashMap only locks segments to achieve synchronization and hence better efficient and faster.

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Q1545. isnt the use of HashTable and ConcurrentHashMap the same, i.e providing synchronized map collection ?

Core Java

Ans. Yes, they both aim at providing synchronized access to the Map collection. The only difference is in their implementation. ConcurrentHashMap came after HashTable and hence technically more efficient as it doesn't lock the complete map while accessing it.

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Q1546. What are the advantages of Spring interceptor over Servlet Filters ?

Spring

Ans. Spring Interceptor are Spring beans and hence they can inject other beans and can be used with other Spring frameworks concepts like AOP.

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Q1547. Upon compiling the following class, What .class files will get created

public class OuterClass{
class InnerClass{
}
}

Core Java

Ans. OuterClass.class AND OuterClass$InnerClass.class

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Q1548. Write a Program to validate an email address

Core Java

Ans. public class Class{
public static void main(String[] args){
String str = "xyz@123.com";

if(!str.contains("@") && !str.contains(".") && (str.indexOf('.') < str.indexOf('@'))){
System.out.println("Not a Valid Email Address");
}
}
}

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Q1549. Write a Program to validate if a particular character occurs after another in a string

Core Java

Ans. public class Class{
   public static void main(String[] args){
      String str = "xyz123.co@m";

      if(str.indexOf('.') < str.indexOf('@')){
         System.out.println("Not a Valid Email Address");
      }
   }
}

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Q1550. 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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Q1551. What is dynacache and role of cachespec.xml in WCS ?

IBM WCS

Ans. Dynacache in WCS is the object cache. Instead of creating objects again and again , the store objects are rendered on the basis of matched rules. Caching rules are stored in a configuration file called cachespec.xml.

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Q1552. Can we see objects cached in Dynacache ?

IBM WCS

Ans. We can see , monitor and can even change dynacache manually but for that we need to install a seperate application provided by WCS.

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Q1553. How to enable Cross Site scripting protection in WCS ?

IBM WCS

Ans. By specifying XSiteScriptingProtection within wc-server.xml. Prohibited characters and attributes are specified within XSiteScriptingProtection to protect the application from any XSS attach.

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Q1554. What is an Asset store ?

IBM WCS

Ans. Asset stores are collections of sharable resources (business artifacts, business processes and storefront assets) that can be leveraged in other stores.

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Q1555. What is an Attribute Dictionary and What are its benefits ?

IBM WCS

Ans. Attribute dictionary is a set of common attributes that can be reused by multiple products.

The attribute dictionary provides a central place to manage shared attributes, with the following features:
The ability to standardize attributes.
The ability to easily compare attributes shared by products and SKUs.
The ability to quickly change attributes in one place to affect all catalog entries.

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Q1556. What is ETL ?

Process

Ans. ETL is Extract , Transform and Load. As the name suggest , it is the process of Data extraction , fabrication and then transfer to Database. Data Migration is one case of ETL.

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Q1557. Whats is a starter store ?

IBM WCS

Ans. Its the default store that comes in built with WCS.

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Q1558. What is SAR file ?

IBM WCS

Ans. Its the Store Archive that holds the store Assets in the compressed form.

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Q1559. What is suborder ?

ECommerce

Ans. Part of the order that needs to be shipped to a particular Address. There could be an Order where different portions needs to be delivered to different addresses. Each portion in such case is a suborder.

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Q1560. What is backorder ?

ECommerce

Ans. The status of an ordered product when inventory allocation has determined that the product is not available.

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Q1561. What is cross-selling ?

ECommerce

Ans. Selling of Merchandise across stores. For example - Store A selling Store B's merchandise.

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Q1562. What is a retriable command ?

IBM WCS

Ans. A retriable command is a controller command that can re-execute itself after encountering a system-level exception during the command execution.

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Q1563. What are the benefits of Smart bean ?

IBM WCS

Ans. A smart data bean uses a lazy fetch method to retrieve its own data. This type of data bean can provide better performance in situations where not all data from the access bean is required, since it retrieves data only as required.

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Q1564. 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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Q1565. 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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Q1566. Is it necessary to register controller command in CMDREG table ?

IBM WCS

Ans. It is not necessary to enter data in the CMDREG table, but an entry should be made in the struts-config.xml. The controller command can be registered in the CMDREG table by xml and SQL query.

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Q1567. What are the tag libraries used in WCS ?

IBM WCS

Ans. Core tags, sql , xml and fmt tags.

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Q1568. What is acugload?

IBM WCS

Ans. acugload is the utility to load the user access group in the appropriate database.

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Q1569. Write a Program to find the missing integer in an array of consecutive numbers?

Core Java

^{This question was recently asked at 'Knight Capital'.This question is still unanswered. Can you please provide an answer.}

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Q1570. How to find the median number in an array of integers ?

Core Java

Ans.

Arrays.sort(numArray);
double median;
if (numArray.length % 2 == 0)
median = ((double)numArray[numArray.length/2] (double)numArray[numArray.length/2 - 1])/2;
else
median = (double) numArray[numArray.length-1/2];

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