Hi everyone, welcome back. In this tutorial, we will be going over HashSets in Java. HashSets can be used to store a collection of data similar to an ArrayList, but the key difference is that each of the elements in a HashSet are unique. In other words, there are no duplicate values in a HashSet, making it a great option when wanting to avoid duplicate values. With this introduction out of the way, let’s get into it.
Creating a HashSet
Let’s start by creating a HashSet. Before we can create the HashSet, we need to make sure that we have our HashSet import, which is included within the java.util package:
import java.util.HashSet;Now, we can successfully create our HashSet:
HashSet<Integer> myHashSet = new HashSet<Integer>();So now, we have created a HashSet variable. Our HashSet is of the ‘Integer’ data type. When we create our HashSet, we need to specify the data type. We can use other data types as well, such as the ‘String’ data type.
Adding Elements Into the HashSet
Now, let’s try to add elements into our HashSet. We can do this by using the built in add() function that is provided. Let’s see an example:
HashSet<Integer> myHashSet = new…