Java Questions
- New features introduced in Java 8
- Why and where to use lambda expressions
- Purpose of functional interfaces, their types, and writing sample code
- Explanation of ConcurrentModificationException
These questions have been taken from Walmart interview experiences shared by candidates in blogs/forums etc in 2026. Use this list for final preparation of your Walmart interviews.
Walmart interviews can include DS & Algo questions along with Java, Spring Boot, database and problem-solving discussions.
Practice the questions more than once so that you can recognize the underlying pattern even when the interviewer changes the wording or adds a follow-up.
Complete list of Walmart DS & Algo interview questions:
https://codezym.com/lld/walmart-dsaIf you are looking for Walmart low level design questions, find them here:
https://codezym.com/lld/walmartJava and Spring Boot questions
Spring Boot Questions
- Annotations used in your project
- Concept of Dependency Injection
- What is a Circular Dependency
- How to efficiently insert 1000 rows into the database
- Basics of JPA (Java Persistence API)
Below are questions which you can practice on LeetCode (free ones):
Longest Increasing Path in a Matrix
https://leetcode.com/problems/longest-increasing-path-in-a-matrix/Perfect Squares
https://leetcode.com/problems/perfect-squares/description/Intersection of Two Linked Lists
https://leetcode.com/problems/intersection-of-two-linked-lists/description/Min Stack
https://leetcode.com/problems/min-stack/description/Valid Anagram
https://leetcode.com/problems/valid-anagram/description/Design Linked List
https://leetcode.com/problems/design-linked-list/description/Number of Islands
https://leetcode.com/problems/number-of-islands/description/Find Number of Ways to Reach the K-th Stair
https://leetcode.com/problems/find-number-of-ways-to-reach-the-k-th-stair/description/Merge Intervals
https://leetcode.com/problems/merge-intervals/description/Sort Colors
https://leetcode.com/problems/sort-colors/description/K Closest Points to Origin
https://leetcode.com/problems/k-closest-points-to-origin/description/Group Anagrams
https://leetcode.com/problems/group-anagrams/description/Longest Substring Without Repeating Characters
https://leetcode.com/problems/longest-substring-without-repeating-characters/description/Coin Change
https://leetcode.com/problems/coin-change/description/Find Minimum in Rotated Sorted Array
https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/description/Longest Increasing Subsequence
https://leetcode.com/problems/longest-increasing-subsequence/description/Below are other frequently asked questions including follow-ups.
Minimum Cost to Build a Skilled Team
Each candidate has a hiring cost and may know Java, Python, both languages, or neither. For every value of k, find the minimum cost of a team in which at least k selected candidates know Java and at least k know Python.
https://codezym.com/question/283-min-cost-to-build-skilled-teamReverse a Character List/Array Recursively
Reverse the supplied characters recursively while preserving every character and returning them in the opposite order.
https://codezym.com/question/284-reverse-character-list-recursivelyCan Attend All Scheduled Meetings
Given a collection of meeting intervals, determine whether one person can attend every meeting without any time overlap.
https://codezym.com/question/285-can-attend-all-scheduled-meetingsDelayed Retry Scheduling for Failed Events
Schedule retries for failed events after the required delay and process eligible retries in a consistent order.
https://codezym.com/question/286-delayed-retry-failed-eventsRefund Rate Limiter for Merchants
Implement a per-merchant refund rate limiter using a rolling five-minute window. Only allowed refunds count toward the limit; rejected attempts are not recorded.
https://codezym.com/question/287-refund-rate-limiter-for-merchantsDesign Feature Toggle Service
Design a feature-toggle service that can add, enable, disable, and remove features. Feature access may depend on a user's subscription and region.
https://codezym.com/question/288-feature-toggle-serviceMove Zeroes and Count Minimum Writes
Move every zero to the end while preserving the order of non-zero values, and calculate the minimum number of writes required to produce the result.
https://codezym.com/question/289-move-zeros-count-minimum-writesConvert String to Equilateral Triangle Format
Arrange the characters of a string into centered rows that form an equilateral-triangle format while preserving the required character order.
https://codezym.com/question/290-string-to-equilateral-triangle-formatMinimum Moves to Gather Balls in Boxes
Given boxes that may contain balls, calculate for every destination box the total number of adjacent moves required to bring all balls into that box.
https://codezym.com/question/292-min-moves-gather-balls-in-boxesLongest Sequence of Consecutive Integers
Given an unsorted collection of integers, return the length of the longest sequence whose values are consecutive.
https://codezym.com/question/293-longest-sequence-of-consecutive-integersCount Number of Distinct Islands in Grid
Count how many different island shapes exist in a binary grid. Islands with the same shape after translation are considered identical.
https://codezym.com/question/190-count-distinct-islands-gridWalls and Gates with the Most Assigned Rooms
Find the nearest reachable gate for empty rooms in a grid and determine which gate is assigned the greatest number of rooms.
https://codezym.com/question/280-walls-and-gates-with-most-assigned-roomsNext Greater Element in a Circular List
For each value in a circular list, return the first greater value encountered while moving forward, or the required missing value when no greater element exists.
https://codezym.com/question/295-next-greater-element-in a circular listMaximum Stock Profit: At Most K Transactions
Given the stock price for each day, return the maximum profit obtainable with at most k buy-and-sell transactions. A stock must be sold before another one is bought.
https://codezym.com/question/297-max-stock-profit-k-transactionsReverse Characters in Each Word of String
Reverse the characters of every word while preserving the original word order and spaces.
https://codezym.com/question/298-reverse-character-each-word-of-stringSort Decimal Real Number Strings
Sort positive, negative, and decimal real-number strings numerically without converting their values to an arithmetic data type. Preserve the original order of equal values.
https://codezym.com/question/299-sort-decimal-number-stringsLocation Stream: Nearest Locations and Top Hotspots
Store normalized latitude and longitude coordinates, return the ten distinct stored locations nearest to a query coordinate, and return the five most frequently recorded locations.
https://codezym.com/question/300-location-stream-top-hotspots