Interview Questions and Answers for 'Compro technologie' | Search Interview Question

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

Q1. Linked List related questions.

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

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Q2. 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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Q3. 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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Q4. 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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Q5. 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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Q6. 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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Q7. 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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Q8. 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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Q9. 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}

Frequently asked in all types of companies especially Indian Services companies. Frequently asked in CTS (Based on 2 feedback)

Q10. 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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Q11. 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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Q12. 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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