scala集合的转换操作

//导入包
import scala.collection.mutable._
val list = List(1,2,3)
val buffer: ListBuffer[Int] = ListBuffer.concat()
//向集合添加元素
 buffer += 2

//导入包
import scala.collection.JavaConverters._
val list: List[Int] = List(2,3)
//将scala集合转换为java集合
val javaList = list.asJava
//这里还要用ArrayList包起来
val ints: util.ArrayList[Int] = new util.ArrayList[Int](java)
 ints.add(2)
 val scalaList = ints.asScala