Scala的Array练习题代码

case class DreamItem(content:String,isDone:Boolean,deadline:String,order:Int)
object zzx {
  def main(args: Array[String]): Unit = {
    //2
    val dreamList = scala.collection.mutable.ArrayBuffer[DreamItem]()
    //3
    dreamList += DreamItem("当老师",false,"2030-9-1",5)
    dreamList += DreamItem("环球旅行",false,"2050-9-10",4)
    dreamList += DreamItem("拥有足够的时间和金钱培养自己的兴趣爱好",false,"2055-10-1",3)
    //4
    dreamList(1) = dreamList(1).copy(isDone = true)
    //5
    dreamList(2) = dreamList(2).copy(order = 2)
    //6 sortwith  排序  结果需要单独保存
   val orderDreamList = dreamList.sortWith((d1,d2) => d1.order > d2.order)

     //7
      val topFiveDreamsIterator = orderDreamList.slice(0,5)  //.iterator.take(10)

      //8
      println("梦想列表:")
      for (dream <- topFiveDreamsIterator){
        println(s"梦想内容：${dream.content},是否完成：${dream.isDone},截止日期:${dream.deadline},优先级:${dream.order}")
      }
    }
}