20+ Amazon Development Centre India Interview Questions and Answers

Oops stands for Object-Oriented Programming. Class is a blueprint for creating objects. Exception is an error that disrupts the normal flow of a program.

• Oops stands for Object-Oriented Programming

• Class is a blueprint for creating objects

• Exception is an error that disrupts the normal flow of a program

• Handling exceptions can be done using try-catch blocks

• Example: try { // code that may throw exception } catch (Exception e) { // handle the exception }

OOPS concepts refer to Object-Oriented Programming principles such as inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class. Example: Parent class 'Animal' and child class 'Dog'.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Class 'Car' with private variables and public methods.

• Polymorphism: Ability to present the same interface for different d...read more

There are two main types of conductors: metallic conductors and electrolytic conductors.

• Metallic conductors: materials like copper, aluminum, and gold that allow the flow of electricity with minimal resistance.

• Electrolytic conductors: materials like electrolyte solutions that conduct electricity through the movement of ions.

React life cycle methods manage component behavior during creation, updating, and destruction.

• Classes: componentDidMount, componentDidUpdate, componentWillUnmount

• Hooks: useEffect, useState, useContext

• Classes: Used for managing state and side effects in class components

• Hooks: Introduced in React 16.8 for functional components

• Example: useEffect hook replaces componentDidMount and componentDidUpdate in functional components

Sort array of strings and return the sorted array

• Use built-in sort function in the programming language of choice

• Ensure to specify the sorting order (ascending or descending)

• Handle edge cases like empty array or array with single element

The current version of React is 17.0.2

• Current version is 17.0.2

• React follows semantic versioning

• Always check official documentation for latest version

Redux can be configured by creating a store, defining reducers, and connecting components.

• Create a Redux store using createStore() function from Redux library

• Define reducers to specify how the state should change in response to actions

• Use combineReducers() to combine multiple reducers into a single reducer function

• Connect components to the Redux store using connect() function from react-redux library

To execute a Java program, compile the source code using the javac command and then run the compiled code using the java command.

• Open a command prompt or terminal

• Navigate to the directory where the Java source code file is located

• Compile the source code using the javac command: javac YourProgram.java

• Run the compiled code using the java command: java YourProgram

• Ensure that the Java Development Kit (JDK) is installed and the PATH environment variable is set correctly

LLM models are a type of machine learning model that combines both labeled and unlabeled data for training.

• LLM stands for Labeled Labeled Model

• They are used in semi-supervised learning where only a small portion of the data is labeled

• LLM models can improve performance by leveraging the unlabeled data to learn more about the underlying structure of the data

Redux is a predictable state container for JavaScript apps. It helps manage the state of your application in a single store.

• Redux is commonly used with React to manage the state of components.

• Actions are dispatched to update the state in the Redux store.

• Reducers specify how the state should change in response to actions.

• Selectors are used to extract specific pieces of state from the store.

• Middleware can be used to add additional functionality to Redux, such as logging or asyn...read more

Power Apps are a suite of apps, services, connectors, and a data platform that provides a rapid application development environment for building custom business apps.

• Power Apps allow users to create custom apps without the need for extensive coding knowledge.

• They can be used to streamline business processes, automate tasks, and connect to various data sources.

• Power Apps can be integrated with other Microsoft services like Power BI, SharePoint, and Dynamics 365.

• Examples of Pow...read more

Objects are instances of classes in object-oriented programming, representing real-world entities with properties and behaviors.

• Objects are instances of classes, which act as blueprints for creating objects.

• Classes define the properties and behaviors of objects.

• Objects can have attributes (properties) and methods (behaviors).

• Example: Class 'Car' defines properties like 'color' and 'model', and methods like 'drive' and 'stop'. An object 'myCar' can be created from this class.

The most repeated number in an array

• Iterate through the array and keep track of the frequency of each number

• Find the number with the highest frequency

• Return that number as the most repeated number

Object-oriented programming (OOP) is a programming paradigm that organizes code into objects with properties and behaviors.

• OOP focuses on creating reusable code by using classes and objects.

• Encapsulation, inheritance, and polymorphism are key principles of OOP.

• Encapsulation hides the internal details of an object and provides a public interface.

• Inheritance allows classes to inherit properties and behaviors from other classes.

• Polymorphism enables objects to take on multiple fo...read more

A sorting program to sort an array of strings

• Use a sorting algorithm like bubble sort, selection sort, or quicksort

• Compare strings using strcmp() function in C or compareTo() method in Java

• Handle edge cases like empty array or array with only one element

SQL commands are used to interact with databases to perform various operations like querying, updating, and deleting data.

• SELECT: Retrieve data from a database

• INSERT: Add new records to a table

• UPDATE: Modify existing records in a table

• DELETE: Remove records from a table

• CREATE TABLE: Create a new table in the database

• ALTER TABLE: Modify the structure of an existing table

• DROP TABLE: Delete a table from the database

Cache memory is a small, high-speed memory unit located between the CPU and main memory, used to store frequently accessed data and instructions.

• Cache memory is faster than main memory, allowing for quicker access to data.

• It helps improve overall system performance by reducing the time needed to access data.

• There are different levels of cache memory (L1, L2, L3) with varying sizes and speeds.

• Examples of cache memory include CPU cache and web browser cache.

Polymorphism is the ability of a function or method to behave differently based on the object it is called with.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal class with methods like eat() can be inherited by classes like Dog and Cat, which can override the eat() method to behave differently.

Syntax for a C program involves writing code using specific rules and conventions.

• Include header files using #include directive

• Declare main function as int main()

• Use semicolons to end statements

• Use curly braces to define code blocks

• Declare variables before using them