20+ AllHeart Web Interview Questions and Answers

This interview includes questions related to constraints, wrapper class, string buffer, and programming.

• Constraints are rules that limit the values or types of data that can be entered into a field or table. There are two types of constraints: column-level and table-level constraints.

• Wrapper classes are classes that encapsulate primitive data types and provide methods to manipulate them. For example, Integer is a wrapper class for the int primitive data type.

• StringBuffer is a...read more

I have experience developing a pharmacy inventory management web application with a team of 3-5 members in collaboration with Virtusa.

• Utilized HTML, CSS, and JavaScript for the front-end development

• Used Node.js and Express.js for the back-end development

• Integrated MySQL database for storing inventory data

• Implemented user authentication and authorization features

• Collaborated with team members to ensure smooth development process

SQL commands for inserting, updating, and deleting data from a table.

• INSERT INTO table_name (column1, column2, column3) VALUES (value1, value2, value3);

• UPDATE table_name SET column1 = new_value1 WHERE condition;

• DELETE FROM table_name WHERE condition;

SQL command for creating a table

• Use CREATE TABLE statement

• Specify table name and column names with data types

• Add any constraints or indexes as needed

A function is a block of code that performs a specific task, while a stored procedure is a named group of SQL statements.

• Functions are used to return a single value, while stored procedures can return multiple values.

• Functions can be called from within SQL statements, while stored procedures are called using their name.

• Functions are typically used for calculations or data manipulation, while stored procedures are used for complex tasks or business logic.

• Functions are defined ...read more

Truncate and drop are SQL commands used to remove data from a table.

• Truncate removes all data from a table but keeps the structure intact.

• Drop removes the entire table and its structure.

• Truncate is faster than drop as it only removes data.

• Drop cannot be undone while truncate can be rolled back.

• Truncate resets the identity of the table while drop does not.

• Examples: TRUNCATE TABLE table_name; DROP TABLE table_name;

Use a single pass algorithm to find the 2nd largest element in an array.

• Iterate through the array and keep track of the largest and second largest elements.

• Initialize two variables to store the largest and second largest elements.

• Compare each element with the largest and second largest elements and update accordingly.

• Return the second largest element at the end of the iteration.

C++ is an extension of C with object-oriented programming features.

• C++ supports classes and objects while C does not.

• C++ has better support for polymorphism and inheritance.

• C++ has a standard template library (STL) while C does not.

• C++ allows function overloading while C does not.

• C++ has exception handling while C does not.

Use a loop to swap characters of two strings without using strcpy function.

• Create two arrays of characters to store the strings

• Use a loop to iterate through each character of the strings and swap them

• Ensure to handle cases where strings have different lengths

Polymorphism is the ability of an object to take on many forms.

• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It is achieved through method overloading and method overriding.

• Example: A parent class Animal can have child classes like Dog, Cat, and Bird. Each child class can have its own implementation of the method 'makeSound', but they can all be called using the same method name from the parent class.

• Java buzzwords related to ...read more

Object class is the root class for all Java classes, providing common methods and behaviors for all objects.

• Object class is at the top of the class hierarchy in Java

• All classes in Java are directly or indirectly derived from the Object class

• Object class provides methods like equals(), hashCode(), toString() which can be overridden in subclasses

LinkedList is a data structure where elements are stored in nodes with pointers to the next element, while ArrayList is a dynamic array that can resize itself.

• LinkedList uses nodes with pointers to the next element, allowing for efficient insertion and deletion operations.

• ArrayList is a dynamic array that can resize itself, making it faster for random access but slower for insertion and deletion.

• LinkedList is more memory efficient as it only needs to store the value and a poi...read more

OOPS concept is a programming paradigm that uses objects and classes for organizing code. Real-time example: Car

• Encapsulation: Car class with private variables like speed, color, and methods like accelerate, brake

• Inheritance: Creating a subclass ElectricCar that inherits from Car class

• Polymorphism: Overriding the accelerate method in ElectricCar class to increase speed differently

Code to reverse a string

• Create an empty string to store the reversed string

• Loop through the original string from the end to the beginning

• Append each character to the empty string

• Return the reversed string

Deep copy creates a new copy of an object with its own unique memory space, while shallow copy creates a new object that references the same memory locations as the original object.

• Deep copy duplicates all nested objects, while shallow copy only duplicates the references to nested objects.

• Deep copy ensures that changes to the copied object do not affect the original object, while shallow copy may lead to unintended side effects.

• Examples: deep copy - using JSON.parse(JSON.stri...read more

HTML is the standard markup language for creating web pages, while HTML5 is the latest version with new features and improvements.

• HTML is older and has limited functionality compared to HTML5

• HTML5 supports new elements like <video>, <audio>, and <canvas>

• HTML5 has improved support for multimedia and mobile devices

• HTML5 includes new APIs like Geolocation, Web Storage, and Web Workers

Annotation used in Spring framework to indicate that a class declares one or more @Bean methods

• Used in Spring framework to define configuration classes

• Identifies a class as a source of bean definitions for the application context

• Helps Spring to understand how beans are created and wired together

Object-oriented programming (OOP) is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.

• OOP focuses on creating objects that interact with each other to solve problems

• Encapsulation: Objects can hide their internal state and require interaction through well-defined interfaces

• Inheritance: Objects can inherit attributes and methods from other objects

• Polymorphism: Objects can take on different fo...read more

Agile methodology is an iterative and flexible approach to software development.

• Agile methodology focuses on collaboration, adaptability, and delivering working software in short iterations.

• It emphasizes customer satisfaction and welcomes changes in requirements throughout the development process.

• It promotes self-organizing teams and encourages continuous improvement through regular feedback and retrospectives.

• Common agile frameworks include Scrum, Kanban, and Extreme Program...read more

Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.

• Variable declarations are hoisted to the top of their scope but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.

I rate myself as highly proficient in Java with extensive experience in developing complex applications.

• Strong understanding of core Java concepts such as OOP, multithreading, and collections

• Experience in developing enterprise-level applications using Java frameworks like Spring and Hibernate

• Proficient in writing efficient and optimized code, with a focus on performance tuning

• Familiarity with Java development tools and IDEs such as Eclipse and IntelliJ IDEA

Joins are used in SQL to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column between them

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the right table

• RIGHT JOIN returns all rows from the right table an...read more

Object-oriented programming paradigm focusing on objects and classes for code organization and reusability.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (object)

• Inheritance: Ability for a class to inherit properties and behavior from another class

• Polymorphism: Ability for objects to be treated as instances of their parent class or their own class

• Abstraction: Hiding complex implementation details and showing only necessary features to the...read more