Question

I am trying to save an integer matrix to the csv file. My code is listed as follows.

try
    {
      FileWriter writer = new FileWriter("test.csv");          
         for(int i = 0; i < row; i++)
         {
            for (int j=0; j<(column-1); j++)
             {
                 writer.append(Matrix[i][j]);
                 writer.append(',');
             }
               writer.append(Matrix[i][j]);
               writer.append('\n');
               writer.flush();
         }
         writer.close();
      }        
    catch(Exception e)
    {
      e.printStackTrace();
    }

However, the Eclipse gives the following error message:

method append(CharSequence) in the type Writer is not
applicable for the arguments (int)

How to solve this issue? Thanks.

Answer 1

Change your calls to append(Matrix[i][j]) to append(String.valueOf(Matrix[i][j]) or append("" + Matrix[i][j]). The problem (as the error message points out) is that you are attempting to append an integer, but the append method only take a CharSequence (i.e. a String). Both of the solutions I present coerce the integer/numeric type to a String.