I am using a map inside another map, The key of the outer map is Integer and the value is another Map. I get the values as expected but I don't know how to get the key and value of teh inner map. Here is the code

Map<Integer, Map<Integer, Integer>> cellsMap = new HashMap<Integer, Map<Integer, Integer>>();
Map<Integer , Integer> bandForCell = cellsMap.get(band_number);
    if (bandForCell == null) 
        bandForCell = new HashMap<Integer, Integer>();
    bandForCell.put(erfcn, cell_found);
    cellsMap.put(band_number, bandForCell);

  csv.writeCells((Map<Integer, Map<Integer, Integer>>) cellsMap);

public void writeCells (Map<Integer, Map<Integer, Integer>> cellsMap ) throws IOException
{
    for (Map.Entry<Integer, Map<Integer, Integer>> entry : cellsMap.entrySet()) {
        System.out.println("Key: " + entry.getKey() + ". Value: " + entry.getValue() + "\n");
    }           
}

Out put of my Map

Key: 20 Value: {6331=0, 6330=1, 6329=1, 6328=0, 6335=1, 6437=0, 6436=1}

The value in the above output is another map. How can I get the key and value of the inner map from the value of the outer map?

Like Keys of inner map = 6331, 6330, 6329 .... and values of inner map = 0 , 1 , 1 , 0 ...

Thanks