Hello
HashSet:
HashSet is a class in Java that implements the Set interface. It is used to store a collection of unique elements, meaning no duplicate elements are allowed. HashSet does not maintain any order for its elements. It is based on a hash table data structure, which allows for efficient insertion, deletion, and lookup operations.
HashCode:
HashCode is a method defined in the Object class in Java. It returns an integer value that represents the object's memory address or a unique identifier generated by the object's contents. The hashCode() method is used in hash-based data structures like HashSet to determine the index where an element should be stored or retrieved.
In the context of HashSet, each object you add to the HashSet is associated with a hash code. When you add an element to a HashSet, Java calculates the hash code for that element using the hashCode() method. This hash code is then used to determine where the element should be stored in the underlying hash table. If two objects have the same hash code (a collision), the HashSet uses additional mechanisms (like equality checks) to handle and store them properly.
HashSet is a collection that stores unique elements using a hash table, and the hash code of an object is used to determine its storage and retrieval within the HashSet.
If you're looking for more in-depth information, I recommend reading the Java documentation on HashSet and the concepts of hashing and hash codes.