ArrayList and double[]

Question

private double[] findAverageFace(ResultSet rs, int rows){
        String path;
        Scanner scanner;
        int picn = 0;
        double[] avgFace = new double[rows * rows];
        try{
            //System.out.println("scanning the result set");
            double[] pic;
            while(rs.next()){
                path = rs.getString(1); //the path to the matrix
                //System.out.println("path: " +path);
                scanner = new Scanner (new File(path));
                pic = new double[rows * rows];
                for(int i=0; i<rows*rows; i++){
                    pic[i] = scanner.nextFloat();
                    avgFace[i] += pic;
//lets add a clone of the pic array
// k++;
//System.out.println("\tmatrix: " + k);
//matricesToolbox.MatrixToolbox.printMatrix(avgFace);
facesArrayList.add(pic.clone());
picn++;
//System.out.println("pic n : "+ picn);
for(int i=0; i<rows*rows; i++)
avgFace[i] /= picn;
return(avgFace);
}catch(Exception e){
e.printStackTrace();
return(null);
private ArrayList calculateDifferenceFaces(double[] avgFace){
ArrayList xArrayList = new ArrayList();
double[] pic;
double[] phi = new double[avgFace.length];
for(int i=0; i< facesArrayList.size(); i++){
pic = (double[]) facesArrayList.get(i);
for(int j=0; j< pic.length*pic.length; j++){
System.out.println(pic[j] + " minus " + avgFace[j]);
//System.out.println(avgFace[j] + "");
phi[j] = pic[j] - avgFace[j];
//System.out.print(phi[j] + " ");
xArrayList.add(phi);
return(xArrayList);
}why in line "System.out.println(pic[j] + " minus " + avgFace[j]);" i get the same values for both pic and avgFace, although in the 1st method i add a clone of pic  facesArrayList.add(pic.clone()); ??                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

I would suggest;
- using a debugger. This will show if the arrays are the same or not. avgFace will be the same each time for each pics as its the same array.
- use nextDouble() as nextFloat() is less accurate (I am guessing not a problem here)]
- don't use pic.clone(), just create a new array at the start of each loop.