private static String[][] lerFicheiro(String nome) throws FileNotFoundException {

        int linhas = contarLinhas(nome);

        Scanner readF = new Scanner(new File(nome));
        String[][] mat = new String[linhas][COLUNAS];

        while (readF.hasNext()) {

            for (int l = 0; l < mat.length; l++) {
                String line = readF.next();
                if (line.length() > 0) {
                    String[] lineS = line.trim().split(";");
                    if(lineS.length==COLUNAS){
                    for (int c = 0; c < mat[0].length; c++) {
                        mat[l][c] = lineS[c];
                    }
                    }

                }
            }

        }
        readF.close();
        return mat;

    }