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Q1381. What are the similarities and differences between Scala and Java ?

Ans. Similarities - Both and Object Oriented and Statically typed languages that runs on JVM.

Difference - Unlike Java, Scala is a Pure Object Oriented language as it doesn't use primitives and static variables.Unlike Java 8 which supports some functional programming concepts, Scala provides support for all functional programming concepts. Java 8 does not support Pattern Matching, Function Currying etc

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Q1382. What is Scala ?

Scala

Ans. Scala is a general purpose programming language that runs on JVM. Its completely inter operable with Java, purely object oriented and has full support for functional programming and a strong static type system.

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Q1383. Does Scala code compile to be Java Byte Code ?

Scala

Ans. Yes, that's the reason Scala code is inter operable with Java and they run smoothly with each other in JVM.

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Q1384. What are some advantages of Scala ?

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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Q1385. What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?

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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Q1386. How does Lazy Initialization helps improving performance of an application ?

Hibernate

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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Q1387. What are the benefits of creating immutable objects ?

Core Java

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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Q1388. Can you name some of the Java frameworks in different domains ?

Frameworks

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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Q1389. What is the difference between

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

and

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

Core Java

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

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Q1390. What are the different J2EE modules ?

Java EE

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

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Q1391. What does the Web module contains ?

Java EE

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

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Q1392. What is an applet ?

Core Java

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

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Q1393. What is archiving ?

Process

Ans. It's the process of preserving the state of an object and then restoring it.

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Q1394. What are callback methods ?

Core Java

Ans. Component methods called by the container to notify the component of the events

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Q1395. What is a certificate authority ?

Security

Ans. A trusted organization which issues public key certificates and provides identification to the bearer.

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Q1396. How and Why Strings are interned in Java ?

Core 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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Q1397. What are the different types of Auctions in WCS ?

IBM WCS

Ans. open cry, sealed bid, and dutch

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Q1398. Can we schedule auctions and promotions in WCS ?

IBM WCS

Ans. Yes

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Q1399. How do we set Auctions in WCS ?

IBM WCS

Ans. Through Accelerator.

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Q1400. Why can't we add Products while specifying Target Catalog entry in Promotions?

IBM WCS

Ans. Product refer to category of Items and hence can't be associated to a particular Stock keeping unit. Items can only be targeted while creating promotions.

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Q1401. What are eSpots and How do we manage them ?

IBM WCS

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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Q1402. Write any sorting algorithm.

Algorithm

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

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Q1403. What will be the output of following code ?

Base Interface

public interface BaseInterface {
   int i = 4;
}

Derived Interfaces

public interface DerivedInterface1 extends BaseInterface{
   int i = 5;
}

public interface DerivedInterface2 extends BaseInterface{
   int i=6;
}

Implementing Class

public class Class implements DerivedInterface1,DerivedInterface2 {
   public static void main(String[] args){
      System.out.println(BaseInterface.i);
   }
}

What will be the output upon executing main and Why ?

Core Java

Ans. It will print 4 because member elements of an interface are implicitly static and hence the concept of overriding doesn't work.

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Q1404. What will be the output of following code ?

Base Interface

public interface BaseInterface {
   int i = 4;
}

Derived Interfaces

public interface DerivedInterface1 extends BaseInterface{
   int i = 5;
}

public interface DerivedInterface2 extends BaseInterface{
   int i=6;
}

Implementing Class

public class Class implements DerivedInterface1,DerivedInterface2 {
int i=10;

public static void main(String[] args){
      System.out.println(new Class().i);
   }
}

What will be the output upon executing main and Why ?

Core Java

Ans. 10

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Q1405. What is the difference between compilation and decompilation ?

Core Java

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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Q1406. Write a class / program that takes few numbers from the input and then output the average ?

Core Java

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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Q1407. Write a program to check is a string is substring of another ?

Core Java

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";

      if(string1.indexOf(string2) >= -1){
         System.out.println("string2 is sub string of string1");
      } else {
         System.out.println("string2 is not sub string of string1");
      }
   }
}

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Q1408. Write a Program to check number of occurrences of one string within another ?

Core Java

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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Q1409. 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)

Core Java

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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Q1410. 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

Core Java

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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