Example: Remove Duplicates using HashSet in Java

// Remove Duplicates using HashSet
import java.util.HashSet;
import java.util.Arrays;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        // Step 1: Define the array with duplicate elements
        Integer[] originalArray = {1, 2, 3, 2, 1, 4, 5, 4, 6};
        System.out.println("Original Array: " + Arrays.toString(originalArray));

        // Step 2: Create a HashSet and add all elements from the array
        // HashSet automatically handles uniqueness
        Set<Integer> uniqueElements = new HashSet<>(Arrays.asList(originalArray));

        // Step 3: Convert the HashSet back to an array
        // Using toArray(new T[0]) for type safety
        Integer[] arrayWithoutDuplicates = uniqueElements.toArray(new Integer[0]);

        // Step 4: Print the array after removing duplicates
        System.out.println("Array without Duplicates (HashSet): " + Arrays.toString(arrayWithoutDuplicates));
    }
}