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Q1031. What are some advantages of 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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Q1032. What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?

Ans. Make sure that the properties of dependent Hibernate entities are not accessed and if yes, better wrap the whole code within single transaction.

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Q1033. How does Lazy Initialization helps improving performance of an application ?

Ans. Lazy Initialization means , Load Dependencies when required. Which means less load on application resources as only required data is loaded upfront. It's not only good for better performance but for better resource utilization too.

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Q1034. What are the benefits of creating immutable objects ?

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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Q1035. Can you name some of the Java frameworks in different domains ?

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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Q1036. What is the difference between

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

and

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

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

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Q1037. What are the different J2EE modules ?

Ans. 1. Application Client Module
2. Web Module
3. EJB
4. Resource Adapter

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Q1038. What does the Web module contains ?

Ans. JSP files, media files and deployment descriptor ( web.xml )

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Q1039. What is an applet ?

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

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Q1040. What is fulfillment center ?

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

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Q1041. How and Why Strings are interned in 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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Q1042. What are eSpots and How do we manage them ?

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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Q1043. Write any sorting algorithm.

Ans. https://javasearch.buggybread.com/InterviewQuestions/questionSearch.php?searchOption=label'

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_{Like Discuss Correct / Improve Algorithm Sorting Algorithm Asked in 4 Companies basic frequent}

Q1044. What is the difference between compilation and decompilation ?

Ans. Compilation is the process of converting Java source files to class files which can be executed by the Java runtime environment whereas Decompilation is the process of converting class files back to the Java Source code.

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Q1045. Write a class / program that takes few numbers from the input and then output the average ?

Ans. public class Class{
   public static void main(String[] args){
      List<Integer> collector = new ArrayList();

      Scanner scanner = new Scanner(System.in);
      int x = scanner.nextInt();
      while(x != 0){
         collector.add(x);
         x = scanner.nextInt();
      }
      System.out.println(collector.stream().collect(Collectors.averagingInt(p->((Integer)p))));
   }
}

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_{Like Discuss Correct / Improve coding code collector streams Collectors.average Asked in 1 Companies}

Q1046. Write a Program to check number of occurrences of one string within another ?

Ans. public class Class{
   public static void main(String[] args){
      String string1 = "Hello I am Jack. I live in United States. I live in california state.";

      String string2 = "I live in";

      int startIndex = 0;
      int endIndex = string1.length()-1;

      int countNoOfOccurences = 0;

      String remainingString = string1;

      while(startIndex < endIndex){
         if(remainingString.indexOf(string2) != -1){
            countNoOfOccurences++;
            startIndex = remainingString.indexOf(string2) + string2.length();
            remainingString = remainingString.substring(startIndex);
         } else {
            break;
         }
      }

      System.out.println(countNoOfOccurences);
   }
}

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

Q1047. Write a Program to check if string is a Colidrome ?
(Colidrome is a word that has n alphabets followed by the reverse of the n alphabets, for ex - mallom)

Ans.
public class Class {
   public static void main(String[] args) {
      String str = "mallam";
      String firstHalf = str.substring(0, str.length() / 2);
      String secondHalf = str.substring(str.length() / 2);

      if (firstHalf.equals(new StringBuilder(secondHalf).reverse().toString())) {
         System.out.println("It's a Colidrome");
      } else {
         System.out.println("It's not a Colidrome");
      }
   }
}

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Q1048. Write a program in Java that prints the numbers from 1 to 100. But for multiples of three print Fizz instead of the number and for the multiples of five print Buz. For numbers which are multiples of both three and five print FizzBuzz

Ans. public class Class{
public static void main(String[] args){
for(int i=1;i<= 100;i++){
if(i%3 == 0){
if(i%5 == 0){
System.out.println("FizzBuzz");
}
System.out.println("Fizz");
} else if(i%5 == 0){
System.out.println("Buzz");
} else {
System.out.println(i);
}

}
}
}

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Q1049. Describe a project that didn't go well and what did you learn from it?

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

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Q1050. 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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Q1051. 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}

Q1052. 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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Q1053. 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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Q1054. 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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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 ?

Ans. boolean
byte
char
double
float
int
long
short
void

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Q1057. 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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Q1058. 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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Q1059. 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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Q1060. What are the different types of log files you have come across ?

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

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