Interview Questions and Answers for 'C' | Search Interview Question

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Q1141. Difference between Scriptlet and JSTL.

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Q1142. Write an efficient program for printing k largest elements in an array. Elements in array can be in any order.

Data Structure

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Q1143. What are falsy attributes in javascript ?

Javascript

Ans. A falsy value is something which evaluates to FALSE, for instance when checking a variable. There are only six falsey values in JavaScript: undefined, null, NaN, 0, "" (empty string), and false of course.

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Q1144. What is abstraction ?

Design

Ans. Abstraction is a process of hiding the implementation details and describing only the functionality to the user.

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Q1145. Is ICICI netbanking using webservices?

Web Service

Ans. Yes

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Q1146. What is the default data type of Serialized methods?'

Core Java

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Q1147. Why cant we start an identifier with a number in Java?

Core Java

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Q1148. Which java features makes java different from other languages ?

Core Java

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Q1149. What is mutable in Java ?

Core Java

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Q1150. what are different pointer operators used ?

Core Java

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Q1151. Can you explain software design principles cohesion and coupling with an example?

Design

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Q1152. Can you write the code for implementing the one to many (student -> courses) relationship in hibernate?

Hibernate

Ans. @OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "student_id")
private Set countries;

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Q1153. What is meant by dirty object checking in hibernate ?

Hibernate

Ans. Dirty Checking is one of the features of hibernate. In dirty checking, hibernate automatically detects whether an object is modified (or) not and need to be updated. As long as the object is in persistent state i.e., bound to a particular Session, Hibernate monitors any changes to the objects and executes sql.

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Q1154. Write a method it will return reverse of the string(with out using reverse method of String or StringBuffer)

Core Java

Ans. String s1 = "akhilesh";
char[] ch = s1.toCharArray();
for (int i = ch.length-1 ; i >=0 ; i--) {
System.out.print(ch[i]);
}

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Q1155. What is the default data type of state variables in Clonable interface and Serializable interface ?

Core Java

Ans. Cloneable and Serializable are Marker Interfaces, So these are empty interfaces with no variables.

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Q1156. What is monkey patching ?

Design

Ans. The term monkey patch only refers to dynamic modifications of a class or module at runtime, motivated by the intent to patch existing third-party code as a workaround to a bug or feature which does not act as desired.

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Q1157. Write a method that takes an integer and verifies if the number is power of 10.

Core Java

Ans. public static boolean isPowerOfTen(long input) {

if (input % 10 != 0 || input == 0) {
return false;
}

if (input == 10) {
return true;
}

return isPowerOfTen(input/10);
}

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Q1158. A Kid can go up 1, 2 or 3 stairs in one step. Write a method that takes number of steps in a stair will print all possible ways he can take.

For example , printAllCombinations(3) should print

111
12
21
3

Similarly , printAllCombinations(4) should print

1111
121
13
211
22
31
4

Core Java

Ans. public static String findStep(int n) {
if (n == 1 || n == 0)
return 1;
else if (n == 2)
return 2;
else
return findStep(n - 3) + findStep(n - 2) + findStep(n - 1);
}

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Q1159. Why did you choose programming ?

General

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Q1160. Write a program for binary tree ?

Data Structure

Ans. public class BinarySearchTree {
//Represent the node of binary tree
public static class Node {
int data;
Node left;
Node right;
public Node(int data) {
//Assign data to the new node, set left and right children to null

this.data = data;
this.left = null;
this.right = null;
}
}
//Represent the root of binary tree

public Node root;
public BinarySearchTree() {
root = null;
}

//factorial() will calculate the factorial of given number

public int factorial(int num) {
int fact = 1;
if (num == 0) return 1;
else {
while (num > 1) {
fact = fact * num;
num--;
}
return fact;
}
}

//numOfBST() will calculate the total number of possible BST by calculating Catalan Number for given key

public int numOfBST(int key) {
int catalanNumber = factorial(2 * key) / (factorial(key 1) * factorial(key));
return catalanNumber;
}
public static void main(String[] args) {
BinarySearchTree bt = new BinarySearchTree();

//Display total number of possible binary search tree with key 5

System.out.println("Total number of possible Binary Search Trees with given key: "
bt.numOfBST(5));
}
}

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Q1161. What is a double ended queue?

Core Java

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Q1162. Can we override wait() or notify() ?

Core Java

Ans. No, because these are final.

public final void wait() throws InterruptedException

public final void notify()

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Q1163. how do you share data between JSP and spring controller using Angular JS ?

AngularJS

Ans. For JPS we can use modelAttribute and ModelAndView object to share data between JPS and Controller. In case of Angular JS, the angular js always get data in form of JSON and it can be accessed by REST WS. So the angular js share data with controller in the form of JSON.

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Q1164. How much by default filling ratio in HashMap ?

Core Java

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Q1165. How to convert array to list in Java ?

Core Java

Ans. We can use Arrays.asList

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Q1166. Suppose we have a string "Java is object oriented language" and we have to reverse every alternate word in string. How would we do that using Java program.

Core Java

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Q1167. What are annotations and what are it's advantages ?

Core Java

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Q1168. How ConcurrentHashMap provides better performance compared to HashTable ?

Core Java

Ans. ConcurrentHashMap uses multiple buckets to store Data and hence avoid read locks which facilitates better performance.

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Q1169. What is the use of Object class ?

Core Java

Ans. 1. Default definition for some of the methods , like equals, hashcode etc that gets carried to all objects even if you don't define anything. But that default definition is kind of like assigning 0 to integer, it just provide a safe state , nothing much for comparison.

2. Places where you have no idea about what object you may receive and just want to perform out of 8 basic methods of object class, something like printing their string representation ( defined by their toString method ), or equality ( using their equals method )

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Q1170. How is LinkedList collection class internally implemented ? Is it a Linked List or Doubly Linked List ?

Core Java

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