Question

I have a problem I have been researching for a while on the internet but can not seem to find anything that could help me reach a conclusion.

I have a class Grid. Grid stores a 2D array of type Cell.

public class Grid implements Iterable<Cell>{
    private Cell[][] grid;

And I have class Main. I want to be able to iterate over the 2D array grid inside the Grid object, form the Main in such fashion:

public class Main {
Grid grid;

    for(Cell c: grid){
        //do something
    }
}

I can’t simply add:

public Iterator<Cell> iterator() {
    retrun grid.iterator();
}

Inside my Grid class because it returns an error.

I do not want the Cell objects to hold the coordinates, I would like the 2D array to represent the coordinate system.

Answer 1

Cell[][] doesn’t implement Iterator. You should create a GridIterator inner class in Grid that implements Iterator and whose next() and hasNext() return whatever you consider to be the “next” Cell, until the grid has been traversed.