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 Q781. What is ADT or Abtstract Data Type ?Core Java
Ans. ADT is a container which holds different types of objects with specifications.

For example - Stack, Array, Liked list, Tree

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   Like         Discuss         Correct / Improve     data types  abstract data types

 Q782. Write a method to convert all elements of a set to lower case.Core Java
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=Method+to+convert+all+elements+of+a+collection&category=code

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   Like         Discuss         Correct / Improve     code  coding  string  String.toLowerCase  set  collections

 Q783. Write java code to Get all words from a String and display themCore Java
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=+Get+all+words+from+a+String&category=code

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   Like         Discuss         Correct / Improve     string   get all words from strings   string.split

Recently asked in Sophos
 Q784. Write a Method to get a map of words and their count by passing in the stringCore Java
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=Method+to+get+a+map+of+words&category=code

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   Like         Discuss         Correct / Improve     map  collections     Asked in 2 Companies      intermediate

 Q785. How is static and dynamic polymorphism achieved in Java ?Core Java
Ans. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding.

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   Like         Discuss         Correct / Improve     static polymorphism  object oriented programming (oops)  oops concepts   dynamic polymorphism  object oriented programming (oops)  oops concepts   polymorphism  object oriented programming (oops)  oops concepts   overloading   overriding   broadridg     Asked in 1 Companies      basic        frequent

 Q786. Why can't we declare a class abstract as well as final ?Core Java
Ans. Abstract means that the class is only meant to be subclassed whereas final means that it cannot be subclassed so both concepts - abstract and final are actually mutually exclusive and hence not permitted together.

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   Like         Discuss         Correct / Improve     abstract   final   java keywords     Asked in 1 Companies

Very frequently asked to fresh graduates. Frequently asked in NSEiT and Accenture India
 Q787. 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

 Q788. 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

 Q789. 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

 Q790. 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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 Q791. 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

  Q792. 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

 Q793. 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

  Q794. 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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 Q795. 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.
 Q796. 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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 Q797. 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

 Q798. What is a compilation unit in Java ?
Ans. Java Source Code File

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 Q799. 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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 Q800. What is the difference between following time formats ?

hh:mm:ss
HH:mm:ss
kk:mm:ss
KK:mm:ss		Core Java
Ans. hh= hours in 1-12 format
HH= hours in 0-23 format
kk = Hours in 1-24 format
KK= hours in 0-11 format

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   Like         Discuss         Correct / Improve     Date  Date Time Format  Date Time

 Q801. Write a java program to implement Quick sort ?Core Java
Ans. http://www.programcreek.com/2012/11/quicksort-array-in-java/

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Frequently asked to Fresh graduates.
 Q802. Write a program to implement Binary search ?Core Java
Ans. http://algs4.cs.princeton.edu/11model/BinarySearch.java.html

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   Like         Discuss         Correct / Improve     binary search  search     Asked in 5 Companies      basic        frequent
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 Q803. Which data structure would you recommend for ordered and sorted data?Core Java
Ans. TreeSet and TreeMap are used for maintaining sorted elements.

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   Like         Discuss         Correct / Improve     ordered collections  sorted collections     Asked in 1 Companies      basic        frequent

 Q804. Explain Exception Hierarchy in Java SE ?Core Java
Ans. <a href="http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/" rel="nofollow">http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/</a>

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 Q805. What do you know about JQuery ?Java EE
Ans. jQuery is a cross platform JavaScript library designed to simplify the client-side scripting of HTML. JQuery is the most popular JavaScript library.

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   Like         Discuss         Correct / Improve     jquery     Asked in 1 Companies

 Q806. Can we have try statement without catch? If try statement contains return will the finally block be executed? What happens if there is an exception inside finally block?Core Java
Ans. Yes, with finally.

Yes, finally block will be executed even if there is no exception in try block.

If finally throws an exception, the exception gets thrown to the calling module.

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   Like         Discuss         Correct / Improve     exception handling     Asked in 1 Companies      intermediate

Very Frequently asked to fresh graduates and less experienced.
 Q807. What are the principle concepts of Object Oriented Programming ?Core Java
Ans. Abstraction Polymorphism Inheritance Encapsulation

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   Like         Discuss         Correct / Improve     oops  oops concepts     Asked in 1 Companies      basic        frequent

 Q808. What is an IP address ?Java EE
Ans. An Internet Protocol address is a numerical label assigned to each device participating in a computer network.

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   Like         Discuss         Correct / Improve     ip address     Asked in 2 Companies      basic        frequent

 Q809. In case of a synchronized method, Does the method only gets locked or the whole object ?Core Java
Ans. Just the method gets locked.

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 Q810. Can you assign value to a static final type at runtime ?Core Java
Ans. No

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