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

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Q1171. What will be the output of following code

public class BuggyBread {
   static class A {
      A() {
         f();
      }

      public void f() {
         System.out.println("A ctor");
      }
   }

   static class B extends A {
      B() {
         f();
      }

      public void f() {
         System.out.println("B ctor");
      }
   }

   public static void main(String[] args) {
      B b = new B();
      b.f();
      A a = new A();
      a.f();
   }
}

Core Java

Ans. B ctor
B ctor
B ctor
A ctor
A ctor

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Q1172. What is the difference between ServletConfig and ServletContext ?

Java EE

Ans. http://www.java4s.com/java-servlet-tutorials/difference-between-servletconfig-and-servletcontext-in-java/

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Q1173. What steps are needed to create a new promotion type ?

IBM WCS

Ans. a. Create necessary lzx files( template , object definition and properties ), make config entries and then Build open Laszlo project ( for LOBTools ) so that new promotion type should be displayed in management center.

b. Create a new promotion type xsl ( promotion type template ) and then map it to the promotion type.

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Q1174. How can you check the status of an ORDER ?

IBM WCS

Ans. By querying the STATUS from the ORDERS table.

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Q1175. I want to collect email addresses of all Registered Users. Which table should I refer ?

IBM WCS

Ans. ADDRESS

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Q1176. How can i get to know all the active promotions without going to management center ?

IBM WCS

Ans. We can query the DB as follows

Select NAME from PX_PROMOTION where STATUS=1;

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Q1177. How can we remove a JSP page from getting cached ?

IBM WCS

Ans. Remove the jsp entry from cachespec.xml.

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Q1178. Where do we store DB configuration and how can we change that ?

IBM WCS

Ans. wc-server.xml stores the DB configuration. We can either change it manually or by using setdbtype command.

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Q1179. Which table holds the encrypted login password ?

IBM WCS

Ans. USERREG

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Q1180. How can we enable promotion engine logs ?

IBM WCS

Ans. By making Debug=true within WCSPromotionEngineConfig.xml

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Q1181. What are the steps to create a new business policy ?

IBM WCS

Ans. Step 1 - Create a new policy definition by adding record in tables POLICY, POLICYDESC.
Step 3 - Associate commands to the new policy by adding records in POLICYCMD.
Step 2 - Associate the new policy with its terms and conditions by adding a record in relationship table POLICYTC.
Step 4 - Add reference to the policy in the repective contract xml file.

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Q1182. Define Business policy categories provided by WCS ?

IBM WCS

Ans. Catalog business policies

Catalog business policies define the scope and characteristics of the catalog of products for sale in a store including prices and the categorization of products in a store's catalog.

Payment business policies

Invoicing, payment, and refund business policies define how a store accepts payments, pays refunds, and the format of a store's invoices.

Returns business policies

Returns business policies define if refunds are accepted, the time period they are accepted for, and any re-stocking fees applied to returns.

Shipping business policies

Shipping business policies define the shipping providers a store can use and the charges associated with each type.

Referral interface business policies

Referral interface business policies define the relationship between a proxy store and a remote store.

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Q1183. Where do we specify the buyer seller relationship ?

IBM WCS

Ans. In the contract xml files.

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Q1184. Explain some of the features of Java ?

Core Java

Ans. Object Oriented - Java is object oriented but isn't purely object oriented as we have primitives along with objects.

Platform Independent - As JVM provides the translation to the Machine code as per the underlying Operating System.

Interpreted as well as compiled - Java files are compiled as class files and then class files are interpreted by JVM.

Runs on a Virtual Machine - Which is JVM that acts as an independent sub environment.

Multi-threaded - As applications can run on single thread as well as multi thread.

Modularity - Through usage of Classes , methods and Interfaces.

Robust

Usage in variety of Application types - Web , Gaming, BigData.

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Q1185. Name some of the Java Keywords ?

Core Java

Ans. Static , Final , Synchronized, private , public , protected, volatile, transient, super, this,import , abstract,native,default (effective java 8), new

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Q1186. Which operators in Java have highest precedence ?

Core Java

Ans. Braces, i.e () and [] have the highest precedence

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Q1187. Which class is the root class of all Exceptions in Java ?

Ans. Throwable

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Q1188. What is MAC Address ?

Networking

Ans. A media access control address is a unique identifier assigned to network interfaces for communications at the data link layer of a network segment. MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet and Wi-Fi.

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Q1189. What is an exception and exception handling in Java ?

Core Java

Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected.

Exception handling is the mechanism which is used to handle such situations.

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Q1190. What technical stuff you like to do in your free time ?

General

Ans. [Open Ended Answer]

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Q1191. What was the most difficult task in your last job ?

General

Ans. [Open Ended Answer]

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Q1192. What is a factory design pattern ?

Design

Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object.

So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object.

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Q1193. How is hashcode calculated in java ?

or

What are the rules for hashcode calculation ?

Core Java

Ans. General contract of hashCode is:

1.Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer,

2.If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.

3.It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results.

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Q1194. Why main method is declared static ?

Core Java

Ans. static is the keyword that makes it accessible even without creating any object and using class name only. Making it non static would like creation of object upfront before calling the method.

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Q1195. What is Spring Security ?

Spring

Ans. Spring Security is a powerful and highly customizable authentication and access control framework. It is the de facto standard for securing Spring-based applications.

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Q1196. Create a Class Bank with the methods to deposit and Withdraw ?

Core Java

Ans. class Bank {
int balance;

Bank(){
balance = 0;
}

void deposit(int amount){
balance = balance amount;
}

int withdraw(int amount){
balance = balance - amount;
return balance;
}
}

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Q1197. Write code for LRU Cache

Core Java

Ans. https://www.geeksforgeeks.org/lru-cache-implementation/

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Q1198. Explain your experience with Java, spring and web services?

General

Ans. Have worked on Java 7 and Java 8, In Java 8 , Worked with streams , lambda expression and default methods.

Have worked on both Spring Mvc and Spring Boot, using Spring dependency injection, Rest services , AOP , JDBC and Hibernate integration.

Have worked on Rest services using Spring and Spring Boot. Have worked on SOAP web services too.

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Q1199. Can a constructor throw an exception ?

Core Java

Ans. Yes

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Q1200. Can constructor be synchronized in Java ?

Core Java

Ans. No, constructors can not be synchronized in Java. In fact using the keyword synchronized with a constructor results in compilation error.

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