TCS Interview Questions and Answers

Program to remove duplicate elements from ArrayList

• Create a new HashSet to store unique elements

• Iterate through the ArrayList and add elements to the HashSet

• Convert the HashSet back to an ArrayList to remove duplicates

Program to print Longest non repeating substring

• Use a sliding window approach to iterate through the string

• Keep track of the characters seen so far in a set

• Update the start index of the substring when a repeating character is encountered

• Calculate the length of the current substring and update the longest substring found so far

Design DB schema and create RESTFul API using SpringBoot

• Design the database schema with tables, relationships, and constraints

• Create entity classes in Java corresponding to the database tables

• Use Spring Data JPA to interact with the database

• Implement RESTful endpoints using Spring Boot controllers

• Use annotations like @GetMapping, @PostMapping, @PutMapping, @DeleteMapping for mapping HTTP requests to controller methods

• Serialize and deserialize data using JSON for API communica...read more

A Java program to reverse a string.

• Create a char array from the input string

• Use two pointers to swap characters from start and end of the array

• Convert the char array back to a string and return

A calculator app with all functionality

• Create a UI with buttons for numbers, operators, and functions

• Implement logic to perform calculations based on user input

• Include features like memory functions, history of calculations, and error handling