Get the position of the nth occurrence of the string

/**
     *  Delete the specified column 
     *
     * @param str    |  Parameter name  |  Parameter description  |  Whether must  |  data type  | schema |
     * @param column 6
     * @return |  Parameter name  |  Parameter description  |  Whether must  |  data type  |
     * @throws Exception Exception
     */
    private static String removeColumn(String str, int column) throws Exception {
        int startIndex = getIndexOf(str, column);
        int endIndex = getIndexOf(str, column + 1);
        return str.substring(0, startIndex) + str.substring(endIndex);
    }


    /**
     *  Get the string number N The location of the second occurrence 
     *
     * @param line  |  Parameter name  |  Parameter description  |  Whether must  |  data type  | schema |
     * @param count  How many times 
     * @return index  Index subscript 
     */
    private static int getIndexOf(String line, int count) {
        int index = 0;
        int findCount = 0;
        while ((index = line.indexOf("|", index)) != -1) {
            if (++findCount == count) {
                return index;
            }
            index++;
        }
        throw new RuntimeException(line + "-------" + count);
    }