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

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Q211. Write an algorithm to shift a linked list n positions.

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Q212. Given 3 arrays - A, B and C, Write all elements from C that are a sum of 1 element from A and 1 from B.

For example -

A -[1,2,4,6]
B-[3,9]
C-[2,4,5,6,7,9,10,12,15]

Output - 4,5,7,9,15

Ans. public class MyClass {

static boolean binarySearch(int [] c, int start, int end, int value) {
while (start <= end) {
int mid = (start end) / 2;
if (c[mid] == value) {
return true;
}
if (c[mid] > value) {
end = mid - 1;
} else {
start = mid 1;
}
}
return false;
}

public static void main(String args[]) {
int [] a = new int[] {1,2,4,6};
int [] b = new int[] {3,9};
int [] c = new int[] {2,4,5,6,7,9,10,12,15};

for (int i = 0; i < a.length; i ) {
for(int j = 0; j < b.length; j ) {
int value = a[i] b[j];
boolean find = binarySearch(c, 0, c.length - 1, value);
if (find) {
System.out.print(value " ");
}
}
}
}
}

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Q213. Write a program to rotate a matrix.

Core Java

Ans. public class Matrix {

   public static void main(String[] args) {
      int[][] matrix = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
      };
      Matrix.rotateMatrix(matrix);
      for (int i = 0; i < matrix.length; i ){
         for (int j = 0; j < matrix.length; j ){
            System.out.print(matrix[i][j] " ");
         }
         System.out.println();
      }
   }

   public static void rotateMatrix(int[][] matrix){
      int row = matrix.length;
      //first find the transpose of the matrix.
      for (int i = 0; i < row; i ){
         for (int j = i; j < row; j ){
            int temp = matrix[i][j];
            matrix[i][j] = matrix[j][i];
            matrix[j][i] = temp;
         }
      }
      //reverse each row
      for (int i = 0; i< row; i ){
         for(int j = 0; j< row/2; j ){
            int temp = matrix[i][j];
            matrix[i][j] = matrix[i][row - 1 - j];
            matrix[i][row - 1 - j] = temp;
         }
      }

   }

}

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Q214. What is the time complexity and space complexity of reversing a Linked List ?

Data Structure

Ans. o(n) for time complexity
o(1) for space complexity

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Q215. How does hashmap works ?

Core Java

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Q216. How do you achieve String immutability ?

Core Java

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Q217. Can we override behavior of a collection class ? How ?

Core Java

Ans. Yes. We can do that.

1. We can create own own implementation class extending the collection class and then override the behavior method.

2. We can override the behavior at the time of instantiation of class as following

List<MyType> list = new ArrayList<MyType>() {
public boolean add(MyType mt) {
super.add(mt);
Collections.sort(list, comparator);
return true;
}
};

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Q218. Explain Rest architecture

Rest

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Q219. What is Spring Security in Detail ?

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Q220. Explain unix commands - cat and pwd.

Unix

Ans. by using Cat command we can open and see the file content and as well as redirect the file content to another files

pwd command shows us current working path of the server

cat filename | tail -100

cat file name > filname1

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Q221. What is the difference between map and filter methods in streams ?

Core Java

Ans. By using map , you can transform the object values. The map operation allows us to apply a function, that takes input parameter of one type, and returns something else.

Filter is used for filtering the data, it always returns the boolean value. If it returns true, then item is added to list else its filtered out (ignored)

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Q222. How abstraction works

Core Java

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Q223. How many objects are created when we define a bean with two different name in spring?

Spring

Ans. we wont create the objects because of each and every bean will be an object

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Q224. what annotation do in background in hibernate ?

Hibernate

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Q225. What is Message Queue or MQ ?

Data Structure

Ans. Message queues implement an asynchronous communication pattern between two or more processes/threads whereby the sending and receiving party do not need to interact with the message queue at the same time. Messages placed onto the queue are stored until the recipient retrieves them. Message queues have implicit or explicit limits on the size of data that may be transmitted in a single message and the number of messages that may remain outstanding on the queue.

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Q226. What are the difference between "resetting" and "normalizing" CSS?

CSS

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Q227. How to track immediate parent of the child in selenium using xpath?

Selenium

Ans. Using ./

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Q228. Why Spring boot is preferred over Spring MVC ?

Ans. Spring Boot aims to shorten the code length and provide you with the easiest way to develop a web application. It helps create a stand-alone application with less or almost zero-configuration.

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Q229. Does spaces get's encoded in html encoding ?

Encoding

Ans. Yes they get html encoded. i.e   instead of empty space.

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Q230. What is the difference between html encoding and url encoding ?

Encoding

Ans. HTML Encoding escapes special characters in strings used in HTML documents whereas url Encoding replaces special characters with characters so that they can sent within url.

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Q231. Can you share your experience with encoding and encryption ?

Encoding

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Q232. Can we change permissions recursively for all folders and files within a single folder ?

Unix

Ans. chmod 777 -R /directory

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Q233. How do you ftp files to a different server ? Do you use scp or mput etc.

Unix

Ans. I use both mput as well as scp. mput usually with sftp

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Q234. How would you handle clustering on multiple servers?

Server

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Q235. Explain how a class is loaded ?

Core Java

Ans. Java classLoder is resposible to load java classes.

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Q236. Difference between constructor and method ?

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Q237. What is stress testing ?

Testing

Ans. Stress testing is a software testing activity that determines the robustness of software by testing beyond the limits of normal operation.

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Q238. What if we use all access specifiers ? Is it encapsulation ?

Core Java

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Q239. Difference between class and object with example.

Core Java

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Q240. Is there a way to access a private method from an outside class ?

Core Java

Ans. Through Reflection.

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