scala – 无法覆盖java.lang.String字段.怎么了？

我试图编译包含的代码

class FixedindexedRepository(override val name: java.lang.String,location: URI) extends FixedindexedRepo

其中扩展了FixedindexedRepo,它扩展了java类AbstractIndexedRepo

public abstract class AbstractIndexedRepo implements RegistryPlugin,Plugin,RemoteRepositoryPlugin,IndexProvider,Repository {
...
protected String name = this.getClass().getName();
...

不幸的是,Scala 2.9.2编译器因错误而停止：

.../FixedindexedRepository.scala:29: overriding variable name in class AbstractIndexedRepo of type java.lang.String;
[error]  value name has incompatible type
[error] class FixedindexedRepository(override val name: java.lang.String,location: URI) extends FixedindexedRepo

如何解决这个问题？怎么了？

解决方法

雷克斯说这很难看：

Making a public accessor from an inherited protected Java field

鉴于：

package j;

public class HasName {
    protected String name = "name";
}

然后假的是：

package user

private[user] class HasNameAdapter extends j.HasName {
  protected def named: String = name
  protected def named_=(s: String) { name = s }
}

class User(n: String = "nom") extends HasNameAdapter {
  def name(): String = named
  def name_=(s: String) { this named_= s }
  this name_= n
}

object Test extends App {
  val u = new User("bob")
  Console println s"user ${u.name()}"
  Console println s"user ${u.name}"
}

你被预先警告了丑陋.

我也没有详细说明细节,但周末即将到来.

Unfortunately Scala 2.9.2 compiler stops with an error

你的意思是,幸运的是它会因错误而停止.