如何将 Java Iterable 转换为 Scala Iterable？
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How can I convert a Java Iterable to a Scala Iterable?
提问by Matt R
Is there an easy way to convert a
有没有简单的方法来转换
java.lang.Iterable[_]
to a
到
Scala.Iterable[_]
?
?
回答by Alex Cruise
In Scala 2.8 this became much much easier, and there are two ways to achieve it. One that's sort of explicit (although it usesimplicits):
在 Scala 2.8 中，这变得更加容易，并且有两种方法可以实现。一种显式的（尽管它使用隐式）：
import scala.collection.JavaConverters._
val myJavaIterable = someExpr()
val myScalaIterable = myJavaIterable.asScala
EDIT:Since I wrote this, the Scala community has arrived at a broad consensus that JavaConvertersis good, and JavaConversionsis bad, because of the potential for spooky-action-at-a-distance. So don't use JavaConversionsat all!
编辑：自从我写这篇文章以来，Scala 社区已经达成了一个广泛的共识，它JavaConverters是好的，JavaConversions也是坏的，因为有可能发生远距离动作。所以根本不用JavaConversions！
And one that's more like an implicit implicit: :)
还有一个更像是一种隐含的：:)
import scala.collection.JavaConversions._
val myJavaIterable = someExpr()
for (magicValue <- myJavaIterable) yield doStuffWith(magicValue)
import scala.collection.JavaConversions._
val myJavaIterable = someExpr()
for (magicValue <- myJavaIterable) yield doStuffWith(magicValue)
回答by oxbow_lakes
Yes use implicitconversions:
是使用隐式转换：
import java.lang.{Iterable => JavaItb}
import java.util.{Iterator => JavaItr}
implicit def jitb2sitb[T](jit: JavaItb[T]): Iterable[T] = new SJIterable(jit);
implicit def jitr2sitr[A](jit: JavaItr[A]): Iterator[A] = new SJIterator(jit)
Which can then be easily implemented:
然后可以轻松实现：
class SJIterable[T](private val jitb: JavaItr[T]) extends Iterable[T] {
def elements(): Iterator[T] = jitb.iterator()
}
class SJIterator[T](private val jit: JavaItr[T]) extends Iterator[T] {
def hasNext: Boolean = jit hasNext
def next: T = jit next
}
回答by Xavier Guihot
Starting Scala 2.13, package scala.jdk.CollectionConvertersreplaces deprecated packages scala.collection.JavaConverters/JavaConversions:
开始Scala 2.13，包scala.jdk.CollectionConverters替换不推荐使用的包scala.collection.JavaConverters/JavaConversions：
import scala.jdk.CollectionConverters._
// val javaIterable: java.lang.Iterable[Int] = Iterable(1, 2, 3).asJava
javaIterable.asScala
// Iterable[Int] = List(1, 2, 3)
