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

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Q1051. Write a program for 0 and cross games?

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Q1052. Write Code showing Inheritance

Core Java

Ans. class A {
public void test() {
System.out.println("Class A Test");
}
}

class B extends A {
public void test() {
System.out.println("Class B Test");
}
}

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Q1053. Write a Program / Code showing Inheritance and overridding

Core Java

Ans. class A {
public void test() {
System.out.println("Class A Test");
}
}

class B extends A {
public void test() {
System.out.println("Class B Test");
}

public static void main(String[] args){
A a = new B();
a.test(); // will print Class B Test
}
}

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Q1054. Create a Table with 2 Columns and Insert a row into it

Database

Ans. CREATE TABLE TABLE_NAME (
ID NUMBER PRIMARY KEY,
NAME VARCHAR(50) NOT NULL,
);

INSERT INTO TABLE_NAME(ID, NAME) VALUES(1, "Abc");

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Q1055. What is the difference between circular queue and priority queue ?

Data Structures

Ans. https://qr.ae/TWK2Ok

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Q1056. What are the different primitive data types in Java ?

Core Java

Ans. boolean
byte
char
double
float
int
long
short
void

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Q1057. What is a method reference in Java ?

Core Java

Ans. Introduced with java 8 , Method References help us to point to methods by their name.

A method references is described using :: symbol

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Q1058. Write a Program to print duplicate words in a String

Core Java

Ans. public class BuggyBread {
public static void main(String args[]) {
String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
Set<String> words = new HashSet();
for(String word:str.split(" ")){
if(words.contains(word)){
System.out.println(word);
} else {
words.add(word);
}
}
}
}

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Q1059. Write code to find second largest number in an array of integers.

Core Java

Ans. int arr[]={1,3,5,6,4,8,9,2,10};
Arrays.sort();
System.out.println(arr[arr.length-1]);

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Q1060. What are the different types of log files you have come across ?

Logging

Ans. error , access , authentication , message , database etc

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Q1061. 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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Q1062. 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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Q1063. 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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Q1064. 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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Q1065. 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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Q1066. 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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Q1067. 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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Q1068. 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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Q1069. What is SAR file ?

IBM WCS

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

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Q1070. What is cross-selling ?

ECommerce

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

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Q1071. 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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Q1072. 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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Q1073. What are the tag libraries used in WCS ?

IBM WCS

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

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Q1074. What is acugload?

IBM WCS

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

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Q1075. Write a Program to find the missing integer in an array of consecutive numbers?

Core Java

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Q1076. 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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Q1077. Write a Java program to print 10 random numbers between 1 to 100?

Core Java

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Q1078. Why don't Java objects have destructors ?

Core Java

Ans. Java manages memory using built-in garbage collector

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Q1079. What is the difference between && and & in Java ?

Core Java

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

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Q1080. 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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