IBM Interview Questions and Answers

The sentence you hear in an AI tool

• AI tool: 'Hello, how can I assist you today?'

• AI tool: 'Please provide your query for me to analyze.'

• AI tool: 'I am here to help with any questions you may have.'

ArrayList is a resizable array, Set is a collection of unique elements, HashMap is a key-value pair collection, LinkedHashMap maintains insertion order.

• ArrayList: dynamic array, allows duplicate elements, slower for insertion/deletion

• Set: collection of unique elements, faster for checking element existence

• HashMap: key-value pair collection, allows one null key, faster for key-based operations

• LinkedHashMap: maintains insertion order, slower for key-based operations

Create a stock without using built-in library

• Create a class Stock with attributes like name, price, quantity, etc.

• Implement methods like buy, sell, updatePrice, etc. to manipulate the stock data

• Use arrays or custom data structures to store and manage stock information

Reverse a linked list using recursion

• Create a recursive function to reverse the linked list

• Pass the current node and its next node as parameters in the function

• Update the next pointer of the current node to point to the previous node

HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine its index in the array.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap allows null keys and values, but only one null key.

• HashMap is not synchronized, so it is not thread-safe. Use Conc...read more