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Interview Questions and Answers - Order By Newest

Q2821. what do mean by J2EE and java?

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Q2822. What are the different types of inheritance ?

Core Java

Ans. Single Level
Multi Level
Hierarchical
Multiple
Hybrid

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Q2823. What are the different versions used in your project? example spring version ,java etc

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Q2824. what is the difference between application.properties and application.yml ?

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Q2825. Is there a way to access a private method from an outside class ?

Core Java

Ans. Through Reflection.

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Q2826. Difference between class and object with example.

Core Java

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Q2827. What if we use all access specifiers ? Is it encapsulation ?

Core Java

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Q2828. Difference between constructor and method ?

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Q2829. Find the second largest array element without sorting?

Design

Ans. We initialize two variables first and second to INT_MIN as,
first = second = INT_MIN
then Start traversing the array,
If the current element in array say arr[i] is greater
than first. Then update first and second as,
second = first
first = arr[i]
If the current element is in between first and second,
then update second to store the value of current variable as
second = arr[i]
then Return the value stored in second.

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Q2830. Explain how a class is loaded ?

Core Java

Ans. Java classLoder is resposible to load java classes.

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Q2831. What is ng injectable ?

Angular Js

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Q2832. 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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Q2833. Can we change permissions recursively for all folders and files within a single folder ?

Unix

Ans. chmod 777 -R /directory

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Q2834. difference between the agile model and v model.

Ans. Agile Model:
Agile Model is the software development model in which development and testing process carries on simultaneously. In this model, both development related processes and testing related processes are parallel. This model provides the facility of more interaction between development team, testing team and end-users.

V-Model:
V-Model is the software development model in which testing takes place once the development process is fully complete or almost complete. In V-Model development and testing process are kept quite separate. It is not as reliable as Agile Model.

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Q2835. 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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Q2836. 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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Q2837. what annotation do in background in hibernate ?

Hibernate

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Q2838. 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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Q2839. How abstraction works

Core Java

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Q2840. Explain memory leaks and how to prevent them.

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Q2841. What is the logic behind the shuffle in Music player ?

or

Explain Music player shuffle algorithm.

Algorithm

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Q2842. 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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Q2843. 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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Q2844. Explain Rest architecture

Rest

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Q2845. 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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Q2846. How do you achieve String immutability ?

Core Java

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Q2847. How does hashmap works ?

Core Java

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Q2848. 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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Q2849. 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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Q2850. 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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