Barclays Java Developer Interview Questions and Answers

Round duration - 90 minutes
Round difficulty - Easy

Q1. 
Occurrence of Each Word: Problem Statement
You are given a string S consisting of several words. Your task is to count the number of times each word appears in string S. A word is defined as a sequence of...read more
Ans. 
Count the occurrence of each word in a given string.
• Split the string into words using spaces as delimiters.

• Use a hashmap to store the count of each word.

• Iterate through the words and update the count in the hashmap.

• Output each unique word with its occurrence count.
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Round duration - 30 minutes
Round difficulty - Easy

Q1. 
Anagram Pairs Verification Problem
Your task is to determine if two given strings are anagrams of each other. Two strings are considered anagrams if you can rearrange the letters of one string to form the...read more
Ans. 
Check if two strings are anagrams of each other by comparing their sorted characters.
• Sort the characters of both strings and compare them.

• Use a dictionary to count the frequency of characters in each string and compare the dictionaries.

• Ensure both strings have the same length before proceeding with comparison.

• Handle edge cases like empty strings or strings with different lengths.
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Round duration - 45 minutes
Round difficulty - Medium

Q1. 
Palindromic Substrings Problem Statement
Find the total number of palindromic substrings in a given string STR.
Example:
Input:
"abbc"
Output:
5
Explanation:
The palindromic substrings are: ["a", "...read more
Ans. 
Count the total number of palindromic substrings in a given string.
• Iterate through each character in the string and expand around it to find palindromic substrings.

• Use dynamic programming to store previously calculated palindromic substrings.

• Consider both odd and even length palindromes while counting.

• Example: For input 'abbc', palindromic substrings are ['a', 'b', 'b', 'c', 'bb']. Total count is 5.
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Q2. How can you find the 4th highest salary from a table in a database?
Ans. 
To find the 4th highest salary from a table in a database, you can use a SQL query with the ORDER BY and LIMIT clauses.
• Write a SQL query to select distinct salaries from the table in descending order.

• Use the LIMIT clause to retrieve the 4th row from the sorted list.

• The query would look like: SELECT DISTINCT salary FROM table_name ORDER BY salary DESC LIMIT 3, 1
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Data structures and computer fundamentals

Q1. Data structures
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Q2. Medium leetcode
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