Array remove duplicate elements

Question

I have an unsorted array, what is the best method to remove all the duplicates of an element if present?

e.g:

a[1,5,2,6,8,9,1,1,10,3,2,4,1,3,11,3]
         


        

Answer 1

public class RemoveDuplicateArray {
    public static void main(String[] args) {
        int arr[] = new int[] { 1, 2, 3, 4, 5, 6, 7, 2, 3, 4, 9 };
        int size = arr.length;
        for (int i = 0; i < size; i++) {
            for (int j = i+1; j < size; j++) {
                if (arr[i] == arr[j]) {
                    while (j < (size) - 1) {
                        arr[j] = arr[j + 1];
                        j++;
                    }
                    size--;
                }
            }
        }
        for (int i = 0; i < size; i++) {
            System.out.print(arr[i] + "  ");
        }
    }

}

output - 1 2 3 4 5 6 7 9