Question

帮忙解答一道题

What statement is true?

(a) RMI registry has to be started before attempting to bind the remote object to the registry. Otherwise, a RuntimeException will be cast.

(b) RMI registry has to be started before attempting to bind the remote object to the registry. Otherwise, a java.rmi.ConnectException will be cast.

(c) Clients don’t have to start RMI registry before attempting to bind the remote object to the registry

(d) RMI registry has to be started before attempting to bind the remote object to the registry. Otherwise, a NullPointerException will be cast.

Select one right answer

Answer 1

(a) RMI registry has to be started before attempting to bind the remote object to the registry. Otherwise, a RuntimeException will be cast. //运行时抛出异常
(b) RMI registry has to be started before attempting to bind the remote object to the registry. Otherwise, a java.rmi.ConnectException will be cast. //如果拒绝远程主机对连接的远程方法调用，则抛出 ConnectException。

(c) Clients don’t have to start RMI registry before attempting to bind the remote object to the registry //不能注册
(d) RMI registry has to be started before attempting to bind the remote object to the registry. Otherwise, a NullPointerException will be cast. //name为null时抛出异常NullPointerException

我选(a)

Answer 2

萨

Answer 3

选择B,
在试图将远程对象绑定到注册程序之前,没有启动RMI注册程序将产生java.rmi.ConnectException异常,从而拒绝连接到注册程序。