Question

您好我在尝试从我的服务器获取数组时出现问题。我会尝试尽可能具体。我希望这篇文章不会太长。

public static Appointment[] getAppointments(DateTime date, String titel, String note, Date startDate, Date endDate, String location) {
    Gson gson = new GsonBuilder().create();
    Appointment[] appointments = new Appointment[1];
    CalendarDate calendarDate;

    appointments.setTitle(titel);
    appointments.setNote(note);
    appointments.setStartDate(startDate);
    appointments.setEndDate(endDate);
    appointments.setLocation(location);

    String gsonString = gson.toJson(date);
    String result = GetCalendar(gsonString);



    appointments = (Appointment[])gson.fromJson(result, Appointment[].class);

    return appointments;
}   

private static String GetCalendar(String jsonInput){

    String result = "Error";
    try {
        Socket clientSocket = new Socket("localhost", 8888);
        DataOutputStream outToServer = new DataOutputStream(
                clientSocket.getOutputStream());
        byte[] input = jsonInput.getBytes();
        byte key = (byte) 3.1470;
        byte[] encrypted = input;
        for (int i = 0; i < encrypted.length; i++)
            encrypted[i] = (byte) (encrypted[i] ^ key);

        System.out.println(encrypted);
        outToServer.write(encrypted);
        outToServer.flush();
        BufferedReader inFromServer = new BufferedReader(new InputStreamReader(
                clientSocket.getInputStream()));
        result = inFromServer.readLine();
        clientSocket.close();

    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return result;
}

它应该从此类接收数据，该类位于serverproject上。

public class Events {
ArrayList<Calendar> events = new ArrayList<Calendar>();

public ArrayList<Calendar> getEvents() {
    QueryBuilder qb = new QueryBuilder();
    try {
        ResultSet rs = qb.selectFrom("calendar").all().ExecuteQuery();
        while (rs.next())
        {
            //String values from SQL database (must be created)
            int calendarID = rs.getInt("Calendarid");
            int createdby = rs.getInt("userid");
            Date startDate = rs.getDate("start");
            Date endDate = rs.getTime("end");
            String title = rs.getString("Title");
            String note = rs.getString("Note");
            String location = rs.getString("Location");

            int stringCalendarID = Integer.valueOf(calendarID);
            int stringCreatedby = Integer.valueOf(createdby);

            String stringTitle = String.valueOf(title);
            String stringNote = String.valueOf(note);
            String stringLocation = String.valueOf(location);



            //System.out.println(String.valueOf(startDate.getTime()));

            events.add(new Calendar(stringCalendarID, stringCreatedby, stringTitle, stringNote, stringLocation));               
        }

    } catch (SQLException e) {
        e.printStackTrace();
    }

    return events;
}

public void setEvents(ArrayList<Calendar> calendar) {
    this.events = calendar;
}

但是我在所有约会中都会收到此错误

    appointments.setTitle(titel);
    appointments.setNote(note);
    appointments.setStartDate(startDate);
    appointments.setEndDate(endDate);
    appointments.setLocation(location);

无法在数组类型Appointment []

上调用setTitle（String）我在做错了什么？我希望你能帮忙:)。

Answer 1

数组没有setTitle方法，Appointment做（我假设）。

也许您正在寻找类似的东西：

Appointment appointment = new Appointment();
appointment.setTitle(titlel);
//etc.
Appointment[] appointments = new Appointment[1];
appointments[0] = appointment;

Answer 2

Appointment []创建一个全新的对象类型：一个约会对象数组。它不再只是一个约会对象，因此不会继承setTitle成员。

你必须从数组中获取一个约会对象，然后在其上调用setTitle函数：

例如

Appointment a = appointments[who];
a.setTitle("whatever");

甚至更简单

(appointments[who]).setTitle("whatever");

＆＃34;谁＆＃34;是一个整数，表示两个示例

中约会数组中项的索引

无法在数组类型上调用setText（String）

2 个答案: