https://codewave16.github.io/interviewQuestion/

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Question 1

import java.util.HashMap;

public class PermutationDifference {
    public static int permutationDifference(String s, String t) {

        HashMap<Character, Integer> sIndexMap = new HashMap<>();
        for (int i = 0; i < s.length(); i++) {
            sIndexMap.put(s.charAt(i), i);
        }

       HashMap<Character, Integer> tIndexMap = new HashMap<>();
        for (int i = 0; i < t.length(); i++) {
            tIndexMap.put(t.charAt(i), i);
        }

        int difference = 0;
        for (char c : s.toCharArray()) {
            difference += Math.abs(sIndexMap.get(c) - tIndexMap.get(c));
        }

        return difference;
    }
}

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Question 2

Answer : B

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Question 3

SELECT CASE 
	WHEN Grades.Grade < 8 THEN 'NULL' 
	ELSE Students.Name 
	END 
, Grades.Grade, Students.Marks 
FROM Students, Grades 
WHERE Students.Marks >= Grades.Min_mark AND Students.Marks <= Grades.Max_mark 
ORDER BY Grades.Grade DESC, Students.Name;

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Question 4

WITH AvgAge AS (
    SELECT rating, AVG(age) as avg_age
    FROM tblSailor
    GROUP BY rating
),
MinAvgAge AS (
    SELECT MIN(avg_age) as min_avg_age
    FROM AvgAge
)
SELECT rating
FROM AvgAge
WHERE avg_age = (SELECT min_avg_age FROM MinAvgAge);

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Question 5

pattern : 1 2 4 7 11 16 , next is 22 (+1 , +2 ,+3 , +4,+5,+6… ,if ansnwer >12 , answer - 12)
Answer : October

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Question 6

class Solution {
    public int searchInsert(int[] nums, int target) {
        int left = 0, right = nums.length - 1;
        while (left <= right) {
            int mid = left + (right - left) / 2;
            if (nums[mid] == target) {
                return mid;
            } else if (nums[mid] < target) {
                left = mid + 1;
            } else {
                right = mid - 1;
            }
        }
        return left;
    }
}    

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https://codewave16.github.io/interviewQuestion2/

Question 1: Inside which HTML element do we put the JavaScript?

​​​​Answer: <script>

Question 2: Which method can be used to find the length of a string in Java?

​​​​Answer: length()

Question 3: How do you create a function in JavaScript?

​​​​Answer: function myFunction()

Question 4: In Python, which of the following is used to define a block of code?

​​​​Answer: Indentation

Question 5: Which of the following is a correct syntax to output "Hello World" in Java?

​​​​Answer: System.out.println("Hello World");

Question 6: Which event occurs when the user clicks on an HTML element in JavaScript?

​​​​Answer: onclick

Question 7: How do you insert COMMENTS in Python code?

​​​​Answer: # This is a comment

Question 8: Which keyword is used to create a class in Java?

​​​​Answer: class

Question 9: What is the correct syntax for referring to an external script called "script.js"?

​​​​Answer: <script src="script.js">

Question 10: How do you create a variable with the floating number 2.8 in Python?

​​​​Answer: Both of the above

Question 11: Which method is used to start a thread in Java?

​​​​Answer: start()

Question 12: How do you declare a JavaScript variable?

​​​​Answer: var carName;

Question 13: What is the correct file extension for Python files?

​​​​Answer: .py

Question 14: How can you achieve inheritance in Java?

​​​​Answer: Using the extends keyword

Question 15: How do you write "Hello World" in an alert box in JavaScript?

​​​​Answer: alert("Hello World");

Section 2

Question 16:

SELECT 
    pt.PetType, 
    COUNT(p.PetId) AS Count
FROM 
    PetTable p
JOIN 
    PetTypeTable pt ON p.PetTypeId = pt.PetTypeId
GROUP BY 
    pt.PetType
ORDER BY 
    Count DESC;

Question 17:

public class Solution {
    public ListNode reverseList(ListNode head) {
        ListNode prev = null;
        ListNode current = head;
        while (current != null) {
            ListNode next = current.next;
            current.next = prev;
            prev = current;
            current = next;
        }
        return prev;
    }
}

Section 3

Question 1 : What is @Bean in Spring Boot?

• Annotation in Spring Framework.
• Indicates a method produces a bean managed by Spring container.
• Used in configuration classes.
• Helps in defining beans programmatically.

Question 2 : What is Dependency Injection (DI) and Inversion of Control (IoC)?

Dependency Injection (DI):

• Design pattern.
• Objects receive other objects they depend on.
• Enhances modularity and testability.
  Inversion of Control (IoC):
• Principle in software engineering.
• Control flow inverted, framework calls user's code.
• DI is a specific implementation of IoC.
• Promotes loose coupling.

Question 3 : How does a RESTful API work?

• Uses HTTP requests for operations (CRUD: Create, Read, Update, Delete).
• REST: Representational State Transfer.
• Stateless communication.
• Client-server architecture.
• Resources represented by URIs.

• Standard HTTP methods:
• GET: Retrieve data.
• POST: Create resource.
• PUT: Update resource.
• DELETE: Remove resource.

Question 4 : What is Spring Boot and what are its main features?

• Framework for simplifying Spring application development.
• Provides defaults for code and annotation configuration.
• Main features:
• Embedded servers (Tomcat, Jetty).
• Simplified dependency management (via starter dependencies).
• Auto-configuration.
• Production-ready metrics and health checks.
• Spring Boot CLI for rapid prototyping.

Question 5 : What is Docker and what are its basic components?

• Platform for OS-level virtualization.
• Packages software into containers.
• Basic components:

• Docker Engine:
  • Core software enabling containerization.
  • Includes Docker daemon, API, CLI.
• Docker Hub:
  • Repository for Docker images.
  • Public and private image storage.
• Docker Compose:
  • Tool for defining and running multi-container Docker applications.
  • Uses YAML file to configure application services.

Question 6 : What is CI/CD and why is it important?

• CI (Continuous Integration):
  • Automates integration of code changes.
  • Ensures frequent and reliable integration.
  • Automated testing of code changes.
• CD (Continuous Deployment/Delivery):
  • Automates deployment process.
  • Continuous Deployment: Code changes automatically deployed to production.
  • Continuous Delivery: Code changes automatically prepared for deployment.
• Importance:
  • Speeds up release cycles.
  • Reduces manual errors.
  • Ensures consistent and reliable deployments.
  • Enhances collaboration among development teams.