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Q1051. Write a Program to print count of each character in a String.

Ans. public class BuggyBread {
public static void main(String args[]) {
Map<Character, Integer> countMap = new HashMap();
String str = "hello world";
for (char character : str.toCharArray()) {
if (countMap.containsKey(character)) {
countMap.put(character, countMap.get(character) + 1);
} else {
countMap.put(character, 1);
}
}
System.out.println(countMap);
}
}

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_{Like Discuss Correct / Improve String Code Coding Character Asked in 1 Companies}

Q1052. Write a program for 0 and cross games?

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

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_{Like Discuss Correct / Improve code.coding.0 and cross game Asked in 1 Companies}

Q1053. Write Code showing Inheritance

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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Q1054. Write a Program / Code showing Inheritance and overridding

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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Q1055. Create a Table with 2 Columns and Insert a row into it

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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Q1056. What is the difference between circular queue and priority queue ?

Data Structures

Ans. https://qr.ae/TWK2Ok

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Q1057. What are the different primitive data types in Java ?

Ans. boolean
byte
char
double
float
int
long
short
void

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_{Like Discuss Correct / Improve data types primitive data types Asked in 1 Companies Basic}

Q1058. What is a method reference in 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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Q1059. Write a Program to print duplicate words in a String

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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Q1060. Write code to find second largest number in an array of integers.

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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_{Like Discuss Correct / Improve code coding find in array Asked in 1 Companies}

Q1061. What are the different types of log files you have come across ?

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

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Q1062. Difference between concurrentHashMap and HashTable ?

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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_{Like Discuss Correct / Improve concurrentHashMap HashTable Map Collections Asked in 2 Companies}

Q1063. isnt the use of HashTable and ConcurrentHashMap the same, i.e providing synchronized map collection ?

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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_{Like Discuss Correct / Improve HashTable ConcurrentHashMap map Collections}

Q1064. What are the advantages of Spring interceptor over Servlet Filters ?

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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_{Like Discuss Correct / Improve interceptors servlet filters spring interceptors vs servlet filters}

Q1065. Upon compiling the following class, What .class files will get created

public class OuterClass{
class InnerClass{
}
}

Ans. OuterClass.class AND OuterClass$InnerClass.class

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_{Like Discuss Correct / Improve class files compilation compile inner classes nested classes}

Q1066. Write a Program to validate an email address

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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_{Like Discuss Correct / Improve validate an email address coding code Asked in 3 Companies}

Q1067. Difference between Singleton and Factory Design Pattern ?

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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_{Like Discuss Correct / Improve Design pattern singleton factory singleton vs factory Asked in 4 Companies}

Q1068. What is dynacache and role of cachespec.xml in 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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Q1069. How to enable Cross Site scripting protection in 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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Q1070. What is SAR file ?

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

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Q1071. What is cross-selling ?

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

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_{Like Discuss Correct / Improve cross selling order management ecommerce}

Q1072. Describe Catalog subsystem and the tables used in WCS for managing this ?

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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Q1073. Is it necessary to register controller command in CMDREG table ?

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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Q1074. What are the tag libraries used in WCS ?

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

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Q1075. What is acugload?

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

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Q1076. Write a Program to find the missing integer in an array of consecutive numbers?

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

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_{Like Discuss Correct / Improve Asked in 1 Companies}

Q1077. How to find the median number in an array of integers ?

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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_{Like Discuss Correct / Improve coding Asked in 2 Companies}

Q1078. Write a Java program to print 10 random numbers between 1 to 100?

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

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Q1079. Why don't Java objects have destructors ?

Ans. Java manages memory using built-in garbage collector

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Q1080. What is the difference between && and & in Java ?

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

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_{Like Discuss Correct / Improve operators logical vs bitwise operator}

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