如何將Java List傳遞給Scala，在Scala中對其進行過濾並返回到Java？

Question

例如：

package example.javascala.list; 
import java.util.Arrays; 
import java.util.List; 

public class UseScalaList { 

public static void main(String[] args) { 
    String[] words = {"a", "very", "long", "list", "of", "words"}; 
    List<String> lst = Arrays.asList(words); 

    // Call Scala code here to filter word "a" from Java list and return back List<String> ?   
} 
} 

問題：

• 斯卡拉對象過濾java.util.List<String>

• 如何調用Scala和得到過濾列表回來？

Answer 1

試試這個：

import scala.collection.*; 

Collection<String> filtered = JavaConversions.asJavaCollection(JavaConversions.asScalaIterable(lst).filter(...)); 

UPDATE：

Iterable<String> scalaIterable = JavaConversions.asScalaIterable(lst); 
scalaIterable.filter(...); 
scalaIterable.drop(1); 
scalaIterable.somethingMore(...); 

Collection<String> backToJava = JavaConversions.asJavaCollection(scalaIterable);