How to Convert 2D array into list and Print the list?

Question

I need to convert an 2D array to list and remove the duplicates and print the values.

By using the below code, I'm unable to print the 2D array

When I tried to print it, it is printing the index value.

Even I tried using Iterator,

int array2D [][] = {{111,555,111,78,98},{87,54,53}};
        ArrayList<Integer> numberList = new ArrayList<Integer>();
        for(int i=0;i<array2D.length;i++)
        {
            for(int j=0;j<array2D[i].length;j++)
            {
                numberList.add(i, j);
            }
        }

        System.out.println(numberList);
Iterator iter = numberList.iterator();
          while (iter.hasNext()) {
             System.out.println(iter.next());
          }

Still it is not working.

Answer 1

When I tried to print it, it printing the index value.

It is printing the index value because you added the indexes instead of actual value. You should add the actual value of an array by index i and j like:

 numberList.add(array2D[i][j]);

If you want to remove duplicates you could use Set instead of ArrayList :

Set<Integer> numberList = new LinkedHashSet<>();