How to find if one part of an array is the same as a integer?

Question

I am making a small project. I have a integer inum, and a array of strings fill. I am trying to see which part of the array fill is equal to inum. Here is my code below:

        String input = scan.nextLine();
        int inum = Integer.parseInt(input);
            for(int k = 0; k < 9; k++){
                String cool = "hello";
                cool = "" + inum;
                if(fill[k] == cool){
                    fill[k] = "0";

It seems that the computer is not changing fill[k] to 0. Does anyone know why this is so? Help is appreciated!