To create a HashSet, you first need to import the Java.util.HashSet package. After importing this package, you can now create the Java HashSet using the following syntax: HashSet HashSet = new HashSet<>(); We operate on a HashSet using the following methods: add()- adds the specified set elements addAll()- adds all the elements of the specified set collection iterator()- enables accessing of the Set elements remove()- The specified elements are removed from the HashSet removeAll()- Removes all elements from the set addAll()- Performs union between two sets. import java.util.HashSet; public class HashSetExamples { public static void main(String[] args) { HashSet HS = new HashSet<>(); // Using add() method HS.add(8); HS.add(9); HS.add(10); System.out.println("First HashSet: " + HS); HashSet HS2 = new HashSet<>(); // Using addAll() method HS2.addAll(HS); HS2.add(11); System.out.println("Second HashSet: " + HS2); } } Output: First HashSet : [8, 9, 10] Second HashSet : [8, 9, 10, 11]
The HashSet Methods
How to Add Elements to HashSet
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