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Interview Questions and Answers - Order By Newest

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 Q1111. Write a program / method to input few numbers and then print the sum.
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=946

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Very frequently asked to fresh graduates. Frequently asked in NSEiT and Accenture India
 Q1112. Write a program to Generate prime numbers till a given numberCore Java
Ans. public class Main {
public static void main(String args[]) {
int number = 2;
int count = 0;
long sum = 0;
int givenNumber = 1000;
while (count < givenNumber) {
if (isPrimeNumber(number)) {
sum = number;
count;
}
number;
}
System.out.println(sum);
}
private static boolean isPrimeNumber(int number) {
for (int i = 2; i <= number / 2; i) {
if (number % i == 0) {
return false;
}
}
return true;
}
}

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   Like         Discuss         Correct / Improve     generate prime numbers  code  coding     Asked in 5 Companies      basic        frequent

 Q1113. Write a program to calculate factorial of a number using recursionCore Java
Ans.

public class Factorial {
   public static void main(String[] args){
      int x = 5;
      
      System.out.println(calculateFactorial(x));
   
   }
   
   private static int calculateFactorial(int x){
      if(x==1){
         return 1;
      }
      return x * calculateFactorial(x-1);
   }
}

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   Like         Discuss         Correct / Improve     factorial  calculate factorial  code  coding  recursion     Asked in 1 Companies      basic

 Q1114. Write code for the usage of Builder Design Pattern
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=964

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   Like         Discuss         Correct / Improve     builder design pattern  builder pattern  code  coding      intermediate

 Q1115. Write code for constructor overloadingCore Java
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=965

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   Like         Discuss         Correct / Improve     constructor overloading  code  coding     Asked in 2 Companies      basic

 Q1116. Write code to check if an integer is odd or even using ternary operator
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=963

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   Like         Discuss         Correct / Improve     ternary operator  code  coding

 Q1117. Write code to sort elements of a set
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=952

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 Q1118. In the following code , how many methods needs to be implemented in Class B ?

public interface A{
   public void method1();
   public void method2();
   public void method3();
}

abstract class B implements A{
}		Core Java
Ans. As Class B has been declared abstract , we can either implement any of these methods and just declare rest of them abstract.

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 Q1119. What will the following code print ?

Integer a = 100, b =100;
Integer c = 1000, d = 1000;
System.out.println(a == b);
System.out.println(c ==d);		Core Java
Ans. false
false

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   Like         Discuss         Correct / Improve     object equality  code  coding        frequent

  Q1120. How is multiple inheritance implemented in Java ?Core Java
Ans. There was no multiple inheritance in java before version 8 as implementing multiple interfaces cannot be termed as inheritance.

With Java 8 , came the concept of default methods wherein the class implementing the interface carries the default implementation from the interface and hence facilitating multiple inheritance.

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   Like         Discuss         Correct / Improve     multiple inheritance  object oriented programming (oops)  oops concepts   inheritance  object oriented programming (oops)  oops concepts   oops concept     Asked in 10 Companies        frequent

 Q1121. Write a program for Coin Changer application ?
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=979

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   Like         Discuss         Correct / Improve     coin changer application  coin changing  general electic (ge)

 Q1122. What are the new classes in JDK 1.9 ( Java 9 ) ?
Ans. http://www.buggybread.com/2015/05/java-9-new-classes-and-interfaces-in.html

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   Like         Discuss         Correct / Improve     java9  java 9  jdk1.9  jdk 1.9

 Q1123. What is unmodifiable set / unmodifiable map ? How can we create one ?
Ans. It is an unmodifiable / read only view of the underlying collection. We can use

Collections.unmodifiableSet(Set set)
Collections.unmodifiableMap(Map map)
Collections.unmodifiableCollection(Collection collection)

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 Q1124. What is the use of MethodHandle ?
Ans. MethodHandle is a modern, more flexible, more typesafe way of doing reflection.

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  Q1125. What is a Destructor ? Do we have Destructors in Java ?Core Java
Ans. Destructor is used to de-allocate memory allocated by objects.

There are no destructors in Java. Alternatively, Java provides Automatic garbage collection i.e automatically releasing the un-referenced memory.

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 Q1126. What are JSP Scriptlets?
Ans. Scriptlet allow to write Java code inside JSP like following

<% Java Code %>

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 Q1127. What is struts.devMode?
Ans. The struts.devMode is used to make sure that framework is running in development mode or production mode by setting true or false.

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 Q1128. What is use of Revert in SVN?Tools
Ans. Revert your local changes.

There are 2 types of reverts -

1) Local Revert: It will delete all changes from files which you made after updates and before commit.
2) Repo Revert: Upload the changes to previous Repo.

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   Like         Discuss         Correct / Improve     svn  subversion  version control system  configuration management     Asked in 2 Companies

 Q1129. Can we have multiple threads consuming message stream from a single partition ?
Ans. Yes, by having multiple Consumer Groups.

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   Like         Discuss         Correct / Improve     apache kafka  kafka  kafka consumer  kafka topic partitions  bigdata  consumer group

 Q1130. Can we have multiple threads consuming messages from a single partition if we have single Consumer Group ?
Ans. No, we can only have max 1 thread per partition in a single Consumer Group.

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 Q1131. If we have more threads than partitions in a kafka consumer, How can we model it efficiently ?
Ans. We will have to use multiple consumer groups in that case as threads will remain idle if we use single consumer group. A more sophisticated algorithm could be required with multiple groups if we have to ensure the order of consumption.

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 Q1132. Is Iterator a class ?
Ans. No, iterator is an interface that is used to parse through the elements of a Collection

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 Q1133. Can a lock be acquired on a class? How is it different than the object level lock ?
Ans. Yes, a lock can be acquired on the class. Class level lock is applicable on the whole class and hence on all objects of the class whereas the object level lock is applicable on the respective object.

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 Q1134. Difference between Yielding and Sleeping ?
Ans. When a task invokes its yield method, it returns to the ready state. When a task invokes its sleep method, it returns to the waiting state.

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 Q1135. What is the use of Runtime Class ?
Ans. This class is used to provide access to the Java runtime system

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Frequently asked.
 Q1136. What should a class do if its implementing an interface ?Core Java
Ans. It should either implement all interface methods or declare unimplemented methods as abstract.

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   Like         Discuss         Correct / Improve     interfaces     Asked in 1 Companies      Basic        frequent
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 Q1137. What should a class do if its extending an abstract class ?Core Java
Ans. It should either implement the abstract methods or re-declare them abstract.

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   Like         Discuss         Correct / Improve     abstract class     Asked in 2 Companies      Basic        Frequent

 Q1138. What is a compilation unit in Java ?
Ans. Java Source Code File

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 Q1139. What is Associativity while evaluating a Java statement ?Core Java
Ans. Associativity determines whether an expression is evaluated left-right or right-left. When an expression has two operators with the same precedence, the expression is evaluated according to its associativity.

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   Like         Discuss         Correct / Improve     associativity  expression evaluation  operator

 Q1140. What are different types of variables in Java ?
Ans. 1. Function Local Variables
2. Instance Variables
3. Class variables or static variables

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   Like         Discuss         Correct / Improve     variables     Asked in 1 Companies      basic        frequent

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