Set
The Set interface is part of the Java collections framework and represents a generally unordered collection of unique elements. This means that an element can only be in the set once. The commonly used implementations of the Set interface are HashSet, TreeSet, and LinkedHashSet. Let’s have a quick look at each.
HashSet
Let’s look at the most popular set first: HashSet. This is a widely used implementation of the Set interface based on a hash table. A hash table stores data in key-value pairs, enabling fast lookup by computing an item’s key hash. It provides constant-time performance for basic operations such as add, remove, and contains (checking whether a Set interface contains a certain value).
Constant-time complexity means that the time it takes to perform these operations does not increase when the number of elements in the set grows, assuming that the hash function used to distribute the elements among the buckets does its job well. We’...
