小编Kel*_*nis的帖子

其他动词对我来说都很有意义,但我没有太多关于"post"作为动词的背景.它是否像邮局中的帖子(这有点意义,虽然看起来像是一段时间)或者像在公告板上发帖一样(对我来说不太有意义)？有谁知道谁决定"POST"以及为什么选择它？

我有两个从抽象基类继承的case类.我想在抽象基类上定义一些方法,这些方法在继承case类上使用复制方法(因此返回子类的实例.)有没有办法使用self类型？

示例代码:

abstract class BaseClass(a: String, b: Int) {
  this: case class => //not legal, but I'm looking for something similar

  def doubleB(newB: Int) = this.copy(b = b * 2) //doesn't work because BaseClass has no copy
}

case class HasC(a: String, b: Int, c: Boolean) extends BaseClass(a, b) {
  def doesStuffWithC(newC: Boolean) = {
    ...
  }
}

case class HasD(a: String, b: Int, D: Double) extends BaseClass(a, b) {
  def doesStuffWithD(newD: Double) = {
    ...
  }
}

由于这个问题,我已经想出如何得到我想要的结果: 如何使用Scala的这种类型,抽象类型等来实现Self类型？ …

我已经通过自制软件安装了 neo4j 2.0.0 并启动了服务器。我可以在端口 7474 访问 webadmin 控制台，但是当我运行时，neo4j-shell -host localhost -port 7474我得到：

    non-JRMP server at remote endpoint
java.rmi.ConnectIOException: non-JRMP server at remote endpoint
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:248)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
    at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:341)
    at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
    at java.rmi.Naming.lookup(Naming.java:101)
    at org.neo4j.shell.impl.RmiLocation.getBoundObject(RmiLocation.java:253)
    at org.neo4j.shell.impl.RemoteClient.findRemoteServer(RemoteClient.java:62)
    at org.neo4j.shell.impl.RemoteClient.<init>(RemoteClient.java:55)
    at org.neo4j.shell.impl.RemoteClient.<init>(RemoteClient.java:43)
    at org.neo4j.shell.ShellLobby.newClient(ShellLobby.java:165)
    at org.neo4j.shell.StartClient.startRemote(StartClient.java:295)
    at org.neo4j.shell.StartClient.start(StartClient.java:173)
    at org.neo4j.shell.StartClient.main(StartClient.java:125)

帮助？