I-STEM AI Engineer Interview Questions and Answers

Oops concepts are fundamental to object-oriented programming. They help in creating modular and reusable code.

• Encapsulation - hiding implementation details of an object from the outside world

• Inheritance - creating new classes from existing ones, inheriting their properties and methods

• Polymorphism - ability of objects to take on many forms, depending on the context

• Abstraction - focusing on essential features of an objec

Multiple inheritance is not allowed in Java to avoid the diamond problem.

• Java supports multiple interface inheritance to achieve the same functionality.

• Diamond problem occurs when a class inherits from two classes with a common method.

• Java prioritizes single inheritance to maintain simplicity and avoid ambiguity.

Arrays are fixed in size while ArrayLists can dynamically grow and shrink.

• Arrays are of fixed size while ArrayLists can be resized dynamically.

• Arrays can hold primitive data types and objects while ArrayLists can only hold objects.

• Arrays are faster for accessing elements while ArrayLists are faster for adding and removing elements.

• Arrays use square brackets [] to declare while ArrayLists use angle brackets <>.

• Example: ...read more

Java collections are classes and interfaces that provide a way to store and manipulate groups of objects.

• Java collections include List, Set, Map, Queue, and their respective implementations

• They provide methods for adding, removing, and accessing elements

• Examples include ArrayList, HashSet, TreeMap, and PriorityQueue

Time theta is a measure of the worst-case time complexity of an algorithm.

• It is used to analyze the performance of algorithms.

• It represents the maximum amount of time an algorithm takes to complete.

• It is denoted by the symbol Θ(n).

Bubble sorting is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order.

• Bubble sort is a comparison-based algorithm

• It works by comparing each pair of adjacent elements and swapping them if they are in the wrong order

• The algorithm repeats this process until no more swaps are needed

• It has a worst-case and average-case complexity of O(n^...read more

Code to generate a random number between 15-25

• Use Math.random() to generate a random number between 0-1

• Multiply the result with the range (25-15) and add the minimum value (15)

• Use Math.floor() to round down the result to an integer

NACL and security groups are both AWS network security features, but NACL operates at the subnet level while security groups operate at the instance level.

• NACL is stateless while security groups are stateful

• NACL can allow or deny traffic based on IP addresses, protocols, and ports while security groups only allow traffic

• NACL rules are evaluated in order while security group rules are evaluated independently

• NACL can be ...read more

Public and private subnets can be identified based on their IP address range and their accessibility from the internet.

• Public subnets have IP addresses that are accessible from the internet.

• Private subnets have IP addresses that are not accessible from the internet.

• Public subnets are typically used for resources that need to be accessed from the internet, such as web servers.

• Private subnets are typically used for resou...read more

S3 is for frequently accessed data while Glacier is for long-term archival storage.

• S3 is designed for frequently accessed data while Glacier is for long-term archival storage.

• S3 has low latency retrieval times while Glacier has higher retrieval times.

• S3 is more expensive than Glacier for storage and retrieval.

• Glacier has a tiered pricing model based on retrieval times and storage duration.

• S3 is suitable for storing dat...read more

AMI is a virtual machine while S3 is a storage service in AWS.

• AMI stands for Amazon Machine Image and is a pre-configured virtual machine that can be used to create EC2 instances.

• S3 stands for Simple Storage Service and is a scalable object storage service that can be used to store and retrieve data.

• AMI is used to create EC2 instances while S3 is used to store and retrieve data.

• AMI is used for computing while S3 is use...read more

The parameter for creating group policy using JSON is a JSON object containing the policy settings.

• The JSON object should include the policy name, description, and settings.

• The settings can include values for registry keys, security options, and other policy settings.

• Example: {"policyName": "Password Policy", "description": "Enforces password complexity requirements", "settings": {"MinimumPasswordLength": 8, "PasswordC