Common Java Interview Questions

Since I was looking for a Java Back-End Engineer position, there are some common data structure questions for Java programmers that are easily misunderstood in Java. As I had been a C# developer for several years, I’d like to compare the syntax difference between C# and Java as well. So… Let’s get started.

1. The difference between Set, List, and Map in JAVA

SET is a non-duplicate collection. List is a collection that can contain duplicate elements and can insert, update, delete, and search the elements. Map can store pairs of keys and values as elements in a collection. I organize the comparison of SET, LIST and MAP as the below table.

In C#, there is no MAP. Dictionary is used in C# and represents a collection of keys and values.

Reference

List, Set, Map: https://www.softwaretestingmaterial.com/map-in-java/ https://www.geeksforgeeks.org/difference-between-list-set-and-map-in-java/

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