collection.immutable.Set
转换为的最佳方法是collection.mutable.Set
什么?
问问题
10786 次
2 回答
21
scala> var a=collection.mutable.Set[Int](1,2,3)
a: scala.collection.mutable.Set[Int] = Set(1, 2, 3)
scala> var b=collection.immutable.Set[Int](1,2,3)
b: scala.collection.immutable.Set[Int] = Set(1, 2, 3)
scala> collection.mutable.Set(b.toArray:_*)
res0: scala.collection.mutable.Set[Int] = Set(1, 2, 3)
scala> collection.mutable.Set(b.toSeq:_*)
res1: scala.collection.mutable.Set[Int] = Set(1, 2, 3)
scala> collection.mutable.Set(b.toList:_*)
res2: scala.collection.mutable.Set[Int] = Set(1, 2, 3)
于 2010-07-05T10:29:11.427 回答
12
开始Scala 2.13
,通过工厂建设者申请.to(factory)
:
Set(1, 2, 3).to(collection.mutable.Set)
// collection.mutable.Set[Int] = HashSet(1, 2, 3)
之前Scala 2.13
和开始Scala 2.10
:
Set(1, 2, 3).to[collection.mutable.Set]
// collection.mutable.Set[Int] = Set(1, 2, 3)
于 2019-06-30T09:47:23.710 回答