用 case class 定义DreamItem类

package array

object array05 {
  case class DreamItem(content:String, isDone:Boolean, deadline:String, prior:Int)

  def main(args: Array[String]): Unit = {
    val dream1 = DreamItem("跑步，跑10km", false, "2020-6-6", 1)
    val dream2 = DreamItem("TV关注", false, "2020-12-11", 2)
    val dream3 = DreamItem("体重减少", false, "2020-3-6", 3)

    val dreamList = scala.collection.mutable.ArrayBuffer(dream1, dream2, dream3)

    // 4
    dreamList(1) = dreamList(1).copy(isDone=true)

    // 5
    dreamList(2) = dreamList(2).copy(prior=0)

    // 6
    val oderList = dreamList.sortBy(_.prior)

    // 7
    val newList = oderList.slice(0, 2)

    // 8
    newList.foreach(ele => {
      println("----------------------------------------")
      println(s"内容: ${ele.content}")
      println(s"状态: ${if(ele.isDone) "完成" else "未完成 "}")
      println(s"截止日期: ${ele.deadline}")
      println(s"优先级: ${ele.prior}")
      println("----------------------------------------")
      println()
    })
  }
}