Create HashSet in Java - How to add Elements to HashSet
Last updated Apr 04, 2022To 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<>(); |
The HashSet Methods
We operate on a HashSet using the following methods:
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add()- adds the specified set elements
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addAll()- adds all the elements of the specified set collection
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iterator()- enables accessing of the Set elements
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remove()- The specified elements are removed from the HashSet
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removeAll()- Removes all elements from the set
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addAll()- Performs union between two sets.
How to Add Elements to HashSet
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]
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