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Data Template Infotech Interview Questions and Answers

Updated 16 Oct 2024

Q1. What are the annotations we used in springboot application?

Ans.

Annotations used in Spring Boot applications

  • 1. @RestController - Marks a class as a controller that handles HTTP requests

  • 2. @RequestMapping - Maps HTTP requests to handler methods

  • 3. @Autowired - Injects dependencies into a bean

  • 4. @Service - Marks a class as a service component

  • 5. @Repository - Marks a class as a repository component

  • 6. @Component - Marks a class as a generic Spring component

  • 7. @Configuration - Indicates that a class provides bean definitions

  • 8. @Value - Injects ...read more

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Q2. What is abstract n abstarct methods in java

Ans.

Abstract classes and methods in Java provide a way to define common behavior that can be inherited by subclasses.

  • An abstract class is a class that cannot be instantiated and is meant to be extended by other classes.

  • An abstract method is a method that is declared without an implementation in an abstract class.

  • Subclasses of an abstract class must provide an implementation for all abstract methods.

  • Abstract classes can have both abstract and non-abstract methods.

  • Abstract classes ...read more

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Q3. What are the oops concepts?

Ans.

Object-oriented programming concepts that help in designing and implementing software systems.

  • Encapsulation: bundling data and methods together

  • Inheritance: creating new classes from existing ones

  • Polymorphism: using a single interface to represent different types

  • Abstraction: hiding complex implementation details

  • Encapsulation: grouping related data and methods together

  • Association: relationship between classes

  • Composition: combining objects to create more complex ones

  • Aggregation:...read more

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Q4. What is DOM in js

Ans.

DOM stands for Document Object Model in JavaScript, which represents the structure of a webpage as a tree of objects.

  • DOM is a programming interface for web documents.

  • It allows scripts to dynamically access and update the content, structure, and style of a webpage.

  • DOM represents the HTML elements as objects, allowing manipulation through JavaScript.

  • Example: document.getElementById('myElement') retrieves an element with the specified ID.

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Q5. Second Largest Number

Ans.

Find the second largest number in an array

  • Sort the array in descending order

  • Return the second element in the sorted array

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Q6. Regrading Self join query

Ans.

A self join query is used to join a table to itself in a SQL query.

  • Self join is used when a table needs to be joined with itself to compare rows within the same table.

  • It requires aliasing the table with different names to distinguish between the two instances of the same table.

  • Commonly used in hierarchical data structures or when comparing related rows in a table.

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Q7. Group by query per catagory

Ans.

Group by query is used to group data based on a specific category.

  • Use the GROUP BY clause in SQL to group data based on a specific column

  • Aggregate functions like COUNT, SUM, AVG can be used with GROUP BY to perform calculations on grouped data

  • Example: SELECT category, COUNT(*) FROM products GROUP BY category

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Q8. Find max in array

Ans.

Find the maximum value in an array of strings.

  • Iterate through the array and compare each element to find the maximum value.

  • Convert the strings to numbers if needed before comparison.

  • Handle edge cases like empty array or non-numeric strings.

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Q9. Remove Duplicate

Ans.

Remove duplicates from an array of strings

  • Use a Set to store unique values

  • Convert the Set back to an array to remove duplicates

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