Getter和Setters不工作？ [英] Getter and Setters not working?

问题描述

我现在有两个课程：RemindersDAO.java和ViewLocalReminders.java。

I've got two classes right now: RemindersDAO.java and ViewLocalReminders.java.

我正在尝试访问ViewLocalReminders.java中的变量我试图从RemindersDAO.java中调用它。我是通过使用getter / setter方法组合来做到这一点的。但是，出于某种原因，我的变量值在getter方法中保持设置为0。以下是代码：

I'm trying to get access to a variable that's in ViewLocalReminders.java and I'm trying to call it from RemindersDAO.java. I'm doing this by using the getter/setter method combo. However, for some reason, my variable value keeps getting set to 0 in the getter method. Here's the code:

ViewLocalReminders.java

public class ViewLocalReminders extends SherlockListActivity {

private long reminderID;

    public void onCreate(Bundle SavedInstance) {

    reminderID = 16;
    setReminderID(reminderID);      

    }

    public void setReminderID(long id) {
        id = reminderID;
        System.out.println("Reminder ID Value in Setter: " + reminderID);
    }

    public long getReminderID() {
        return reminderID;
        System.out.println("Reminder ID Value in Getter: " + reminderID);
    }

}

RemindersDAO.java

public class RemindersDAO extends SQLiteOpenHelper {

    @SuppressWarnings("deprecation")
    public Cursor getRowByID(Activity activity) {
    String[] from = { _ID, NAME };

    ViewLocalReminders viewLocalReminders = new ViewLocalReminders();
    long reminderID = viewLocalReminders.getReminderID();
    System.out.println("Value of Reminder ID in RemindersDAO: " + reminderID);

    }

}

这是输出我得到的所有System.out.printlns：

This is the output that I'm getting for all my System.out.printlns:

1. Setter中的提醒ID值：16


2. Getter中的提醒ID值：0


3. Reminders中的提醒ID值DAO：0

很明显，在setter和getter方法之间发生了一些事情。在setter方法中，reminderID的值是16，应该是这样。但是，getter方法中的值为0。因此，当我在RemindersDAO.java中调用getter方法时，该值仍为0。我在这做错了什么？谢谢你的帮助！ ：）

So obviously, something's happening between the setter and getter methods. The value of reminderID is 16 in the setter method, the way it should be. However, the value goes to 0 in the getter method. Consequently, the value is still 0 when I call the getter method in RemindersDAO.java. What am I doing wrong here? Thanks for your help! :)

推荐答案

感谢您的帮助。虽然我遵循了你们所有人的建议，但我无法弄清楚为什么我的吸气剂和制定者不能正常工作。我猜它与remderID作为构造函数的参数被接受的事实有关。无论哪种方式，我通过使用Android的Bundle解决了我的问题，并通过它将我的变量从一个活动转移到另一个活动。

Thanks for all your help you guys. I wasn't able to figure out why my getters and setters weren't working, even though I followed all of your guys' suggestions. I'm guessing it has something to do with the fact that reminderID is taken in as an argument of a constructor. Either way, I solved my problem by using Android's Bundle and transferring my variables from one activity to another through that.

再次感谢您的帮助！ ：）

Again, thanks for all your help! :)

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