scala枚举

定义枚举对象

/** 定义一个枚举类 */
private[deploy] object SparkSubmitAction extends Enumeration {
  // 声明枚举对外暴露的变量类型
  type SparkSubmitAction = Value
  // 枚举的定义
  val SUBMIT, KILL, REQUEST_STATUS = Value
}

使用枚举

/** 定义一个枚举类 */
object SparkSubmitAction extends Enumeration {
  // 声明枚举对外暴露的变量类型
  type SparkSubmitAction = Value
  // 枚举的定义
  val SUBMIT, KILL, REQUEST_STATUS = Value

  def getAction(action: SparkSubmitAction){
  action match {
    case SUBMIT => println ("action is " + action)
    case KILL => println ("action is " + action)
    case REQUEST_STATUS => println ("action is " + action)
    case _ => println ("Unknown type")
  }
}
}

测试用例

object EnumerationTest {
  def main(args: Array[String]): Unit = {
    val action = SparkSubmitAction.apply(1)
    SparkSubmitAction.getAction(action)

    val action1 = SparkSubmitAction.withName("quit")
    SparkSubmitAction.getAction(action1)
  }
}