有什么方法可以在下面选择使用 asJavaIterable 吗?我知道我可以拼出那个特定的函数名称,但我想知道我是否可以声明性地指定我想要的类型.我也很好奇为什么 asJavaIterable 没有优先于 asJavaCollection.
Any way to opt to use asJavaIterable in the following? I know I can just spell out that particular function name, but I'm wondering if I can just declaritively specify the type I want. I'm also curious why asJavaIterable isn't taking precedence over asJavaCollection.
scala> import scala.collection.JavaConversions._ import scala.collection.JavaConversions._ scala> Iterable(0,1):java.lang.Iterable[Int] <console>:11: error: type mismatch; found : Iterable[Int] required: java.lang.Iterable[Int] Note that implicit conversions are not applicable because they are ambiguous: both method asJavaIterable in object JavaConversions of type [A](i: Iterable[A])java.lang.Iterable[A] and method asJavaCollection in object JavaConversions of type [A](i: Iterable[A])java.util.Collection[A] are possible conversion functions from Iterable[Int] to java.lang.Iterable[Int] Iterable(0,1):java.lang.Iterable[Int] ^ 推荐答案可以限制导入的范围,以便不考虑 asJavaCollection:
It's possible to limit the scope of the import so that asJavaCollection will not be considered:
import scala.collection.JavaConversions.{asJavaCollection=>_,_}这表示导入 JavaConversions 的所有成员,除了 asJavaCollection".
This says, "import all members of JavaConversions, except asJavaCollection".
但是,我认为最好导入 JavaConverters 并使您的转换显式.
However, I think its preferable to import JavaConverters and make your conversions explicit.
import scala.collection.JavaConverters._ Iterable(0,1).asJava更多推荐
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