Java接口继承

Question

我写了下面的代码：

package sample;
import org.freedesktop.dbus.DBusInterface;
import org.freedesktop.dbus.DBusInterfaceName;
import org.freedesktop.dbus.DBusConnection;

@DBusInterfaceName("org.mpris.clementine")
interface Player extends DBusInterface, java.rmi.Remote {
    void Pause();
}


class Main {
        public static void main (String[] args) throws org.freedesktop.dbus.exceptions.DBusException, java.lang.InterruptedException {
                DBusConnection dc = DBusConnection.getConnection(DBusConnection.SESSION);
                Player player = (Player) dc.getRemoteObject("org.mpris.clementine", "/Player");
                player.Pause();
                dc.disconnect();
        }
}

得到一个错误的队列

Player player = (Player) dc.getRemoteObject("org.mpris.clementine", "/Player");

上面写着

Exception in thread "main" java.lang.ClassCastException: $Proxy2 cannot be cast to sample.Player

我知道问题出在继承、误解或类似的问题上。我彻底地找过了，但还是找不到答案。如何正确地写这一行？错在哪里呢？

Answer 1

您应该确保由

 dc.getRemoteObject  

实现接口播放器

Answer 2

改用下面的代码：

Object obj = dc.getRemoteObject("org.mpris.clementine", "/Player");
if( obj instanceof Player ) {
    Player player = (Player) obj;
    player.pause();
}

Answer 3

不确定'dc.getRemoteObject()‘是什么，如果它是一个远程操作，你需要解组对象。

Object obj= dc.getRemoteObject("org.mpris.clementine"，"/Player")；

Player =(Player )PortableRemoteObject.narrow(obj，Player.class)