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I attended two interviews at Walmart in October . The first interview focused on data structures and algorithms, and the second was entirely Java-based.
In the first round, I was unable to solve the first data structures and algorithms question correctly, but I performed well on the second question. We were required to write clean code in an editor of our choice.
The second round was purely Java. Some of the questions asked were: New features in Java 8/11, Lambda expressions, Functional Interface, FlatMap, Different Maps, Comparable, Comparator, equals, hashcode, Multithreading, and Polymorphism (the difference between runtime and compile-time).
I performed well in the second round, but I was rejected after the second interview.