Scala的Array习题

 答案：CBBBB

import scala.collection.mutable.ArrayBuffer
//1
case class DreamItem(content:String,var isDone:Boolean,deadline:String,var order:Int)
object p5 {
  def main(args: Array[String]): Unit = {
    //2
    val dreamList=ArrayBuffer[DreamItem]()//梦想清单
    //3
    val dream1=DreamItem("梦想1",true,"2022-5-10",1)
    val dream2=DreamItem("梦想2",false,"2024-9-22",2)
    val dream3=DreamItem("梦想3",true,"2023-2-9",3)
    dreamList+=dream1
    dreamList+=dream2
    dreamList+=dream3

    dreamList+=DreamItem("梦想4",true,"2022-5-10",1)
    dreamList+=DreamItem("梦想5",true,"2022-5-10",1)
    dreamList+=DreamItem("梦想6",true,"2022-5-10",1000)
    dreamList+=DreamItem("梦想7",true,"2022-5-10",1000)
    dreamList+=DreamItem("梦想8",true,"2022-5-10",1000)
    dreamList+=DreamItem("梦想9",true,"2022-5-10",1000)
    dreamList+=DreamItem("梦想10",true,"2022-5-10",1000)

    //4
    dreamList(1).isDone = true

    //5
    dreamList(2).order=100

    //6
    val list=dreamList.sortWith((a,b)=>a.order > b.order)

    val newList=list.slice(0,5)

    list.foreach(e=>{
      println(s"${e.content} \t\t ${e.isDone} \t ${e.order}")
    })


  }
}