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Q3141. How do you achieve String immutability ?

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Q3142. How does hashmap works ?

Core Java

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Q3143. Write a program to find the 10th prime number.

Ruby

Ans. def isPrimeNumber(n):
if(n<=1):
return False:
for i range(2,n):
if(n%i==0):
return False
return True

n=isPrimeNumber(11)
print(n)

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Q3144. 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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Q3145. 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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Q3146. 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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Q3147. Write an algorithm to shift a linked list n positions.

Data Structure

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Q3148. What are FPGA's ?

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Q3149. What are the pros and cons of Lambda expressions ?

Core Java

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Q3150. What is life cycle of cloud deployment process ?

Cloud Computing

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Q3151. What kind of deployable is created for the angular project ?

Angular Js

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Q3152. What would you do if your rest services aren't responding fast enough ?

Rest

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Q3153. If you see a terrible code, Would you rewrite it. If yes , Why ?

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Q3154. If you are given a stack trace , what would you look for ?

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Q3155. Write a program to make a triangle of stars.

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Q3156. Explain SOLID principles.

Design

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Q3157. Explain the lifecycle methods of a Dojo widget.

Dojo

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Q3158. What are the ways we can get over XSS or cross site scripting vulnerability ?

Security

Ans. The counter measures of XSS are input validation and implementing a CSP (Content Security Policy).

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Q3159. How can an XSS attack harm a system ?

Security

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Q3160. Write a code to detect the longest palindromic substring

Core Java

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Q3161. What is headless mode in Java ? Why is it used ?

Core Java

Ans. It’s a mode that can be used for creating Back end application without the front end UI.

The advantage is that it reduces the number of packages that needs to be loaded ( by ignoring ui packages )

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Q3162. What are the distinguished qualities in Java that no other language possess ?

Core Java

Ans. Java is widely adopted as an enterprise standard technology across business domains and technical domains ( Web , Desktop , mobile , data science etc ) and has a vast ecosystem of frameworks and libraries.

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Q3163. What is ServerSocket in Java ?

Core Java

Ans. This class implements server sockets. A server socket waits for requests to come in over the network. It performs some operation based on that request, and then possibly returns a result to the requester.

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Q3164. Can anonymous class implement interface and extend a class

Core Java

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Q3165. What are the types of clouds in cloud computing ?

Cloud Computing

Ans. Private, Public, Hybrid, Community

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Q3166. Explain switch and router

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Q3167. How to get collections from a Stream

Core Java

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Q3168. Class and Object methods.

Core Java

Ans. class:- A class describe the contents of an object, an it describe the detail of data field called instance variable and defines the operations called method.

Object:-An object is an element of a class. Object have the behaviors of their class.

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Q3169. Difference between merge and update in hibernate

Hibernate

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Q3170. What is the programming language used to build Jenkins?

Jenkins

Ans. There is a diverse set of programming languages used in Jenkins, including but not limited to: Java, JavaScript, Groovy, Golang, Ruby, Shell scripts

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