public void setNums(String Matrixnum){
    for (int i = 1; i <= myRows; i++){
        for(int j = 1; j <= myColumns; j++){
            String StrNum = JOptionPane.showInputDialog(null, Matrixnum + " Row " + i + " Column " + j + " enter number:");
            myNums[i][j] = Double.parseDouble(StrNum);
        }
    }
}

public double[][] getNums(){
    for(int i = 1; i <= myRows; i++) {
        for(int j = 1; j <= myColumns; j++) {
            return myNums[i][j];
        }
    }
}

private double[][] myNums;