Removing duplicates from an array.

Hint: Convert Array to Set

Here’s a Java program that removes duplicates from an array:

 import java.util.Arrays;

 import java.util.HashSet;

 public class RemoveDuplicatesFromArray {

    public static void main(String[] args) {

        int[] array = {1, 2, 3, 4, 2, 3, 5, 6, 1, 7};   

        // Convert array to HashSet to remove duplicates

        HashSet<Integer> uniqueElements = new HashSet<>();

        for (int element : array) {

            uniqueElements.add(element);

        }

        // Convert the unique elements back to an array

        int[] newArray = new int[uniqueElements.size()];

        int index = 0;

        for (int element : uniqueElements) {

            newArray[index++] = element;

        }

        System.out.println("Original array: " + Arrays.toString(array));

        System.out.println("Array without duplicates: " + Arrays.toString(newArray));

    }

}

This program first creates a `HashSet` called `uniqueElements` to store the unique elements from the array. It iterates over each element in the array and adds it to the set. Since `HashSet` does not allow duplicates, only unique elements will be stored.

Then, the program creates a new array called `newArray` with the size of the `uniqueElements` set. It iterates over the set and assigns each element to the corresponding index in the new array.

Finally, it prints both the original array and the array without duplicates using `Arrays.toString()` method to convert the arrays to strings.

When you run the program, the output will be:

Original array: [1, 2, 3, 4, 2, 3, 5, 6, 1, 7]

Array without duplicates: [1, 2, 3, 4, 5, 6, 7]

As you can see, the duplicates (2, 3, and 1) have been removed from the array.