public void insert(String[] columnsArray, String[] valuesArray, String table){
        String columns = String.join(", ", columnsArray);

        String values = "'" + String.join("', '", valuesArray) + "'";
        String check = values.substring(values.length()-2, values.length());
        if(check.equals("''")){
            values = values.substring(0, values.length()-2) + "null";
        }
        String sql = "INSERT INTO " + table + " (" + columns + ") VALUES (" + values + ")";
        System.out.println(sql);
        try{
            stmt = conn.createStatement();
            stmt.executeQuery(sql);
        } catch (SQLException e) {
            System.out.println(e.getMessage());
        }
    }