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Interview Questions and Answers for 'Compro technologies' - 12 question(s) found - Order By Newest

Frequently asked in all types of companies especially Indian Services companies. Frequently asked in CTS (Based on 2 feedback)
  Q1. What is the use of hashcode in Java ?Core Java
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc. The value received from hashcode() is used as bucket number for storing elements. This bucket number is the address of the element inside the set/map. when you do contains() then it will take the hashcode of the element, then look for the bucket where hashcode points to and if more than 1 element is found in the same bucket (multiple objects can have the same hashcode) then it uses the equals() method to evaluate if object are equal, and then decide if contain() is true or false, or decide if element could be added in the set or not.

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   Like         Discuss         Correct / Improve     java   collections   hashcode   advanced  hashtable     Asked in 33 Companies      intermediate        frequent

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  Q2. What is reflection ?
Ans. It is the process of examining / modifying the behaviour of an object at runtime.

  Sample Code for reflection

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   Like         Discuss         Correct / Improve     java   reflection   reflection api   ebay   mindtree     Asked in 29 Companies      basic        frequent


 Q3. Write a Program to reverse a Linked List ?Data Structure
 This question was recently asked at 'Myntra,Compro Technologies'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 2 Companies


 Q4. Find the third last element in a linked list ?Data Structure
Ans. First Find the number of nodes in the linked list and take it as n.then find the data at n-3 element.

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   Like         Discuss         Correct / Improve     linkedlist     Asked in 1 Companies


  Q5. 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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   Like         Discuss         Correct / Improve     destructor  garbage collection     Asked in 11 Companies      Basic        frequent

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 Q6. Write a Program to print count of each character in a String.Core Java
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


 Q7. Write a program for 0 and cross games? Core Java
 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


 Q8. Write program to create a linked list and perform different operations on it.Algorithm
Ans. import java.util.*;
class LinkedListSolution{
protected LinkedList list;
public LinkedListSolution(){
list = new LinkedList();
}
public Object pop() throws NoSuchElementException{
if(list.isEmpty())
throw new NoSuchElementException();
else
return list.removeFirst();
}
public void push(Object obj){
list.addFirst(obj);
}
public Object peek() throws NoSuchElementException{
if(list.isEmpty())
throw new NoSuchElementException();
else
return list.getFirst();
}
public boolean isEmpty(){
return list.isEmpty();
}
public String toString(){
return list.toString();
}
}
class TestStack{
public static void main(String args[]){
LinkedListSolution s = new LinkedListSolution();
s.push("First");
s.push("Second");
s.push("Third");
System.out.println("Top: " s.peek());
s.push("Fourth");
while(!(s.isEmpty()))
System.out.println(s.pop());
}
}

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   Like         Discuss         Correct / Improve     Linkedlist  data structures  algorithm     Asked in 2 Companies      basic


 Q9. Given 2 jars of 5 ltr and 3 ltr, how will you get 4 ltrs in one of those jars ?Puzzle
Ans. Number 1 -

Fill the 5 litre can from the tap

Empty the 5 litre can into the 3 litre can leaving 2 litres in the 5 litre can.

Pour away the contents of the 3 litre can.Fill the 3 litre can with the 2 litres from the 5 litre can leaving 2 litres in the 3 litre can.

Fill the 5 litre can from the tap.Fill the remaining 1 litre space in the 3 litre can from the 5 litre can.Leaving 4 litres in the 5 litre can.

Number 2 -

Fill the 3 litre can from the tap.Empty the contents of the 3 litre can into the 5 litre can.

Fill the 3 litre can from the tap.Empty the contents of the 3 litre can into the 5 litre can leaving the 5 litre can full and 1 litre in the 3 litre can.

Pour away the contents of the 5 litre can. Pour the 1 litre from the 3 litre can into the 5 litre can.

Fill the 3 litre can from the tap. Empty the contents of the 3 litre can into the 5 litre can leaving 4 litres in the 5 litre can.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q10. Why do we need Garbage collection ?Core Java
Ans. Garbage collection mechanism frees up the memory that is no longer needed. In languages like C / C++ the deallocation needs to be done explicitly by the programmer and hence any leniency may result in memory leak. Garbage collection in java ensures that all unused memory is reclaimed and hence there are no memory leaks.Moreover it relieves the programmer from the hassle of carefully releasing all memory.

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   Like         Discuss         Correct / Improve     Garbage Collection  memory management     Asked in 2 Companies


 Q11. Write a Program to merge two sorted arrays ?Data Structure
Ans. We can merge two sorted array by using quick sort algorithm

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   Like         Discuss         Correct / Improve     arrays  merge sorted arrays     Asked in 2 Companies


 Q12. Linked List related questions.Data Structure
 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          Asked in 1 Companies



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