Convert between scala list and java list

Convert between scala list and java list

In the job writing of Spark or Flink, most of them usually choose Scala to write, because of its simplicity, without writing too much code.

import java.util
import scala.collection.JavaConverters._

object Test {
    
    
  def main(args: Array[String]): Unit = {
    
    
    // 创建 scala list
    var scalaList = List("1", "2", "3")
    // scala list 转 java list
    val javaList: util.List[String] = scalaList.asJava
    // java list 转 Scala list
    scalaList = javaList.asScala.toList
  }
}