我想要的目錄列表轉換爲字符串使用折deliminator左倍留給名單列表轉換成字符串
我想創建一個字符串,但它有額外的deliminator
trait Msg {
def toCustString(flag:Boolean): String
}
trait Ele[T] extends Msg {
val value: T
override def toCustString(flag:Boolean): String = s"${value}"
}
trait Grp extends Msg {
val list: Seq[Msg]
override def toCustString(flag: Boolean = false): String = {
val sep = if (flag) "\n" else "!"
test((builder: StringBuilder, elem: Msg) => builder.append(s"$sep${elem.toCustString(false)}$sep"))
}
def test(acc: (StringBuilder, Msg) => StringBuilder): String = {
list.foldLeft(StringBuilder.newBuilder)(acc).toString()
}
}
case class MyMessage(list:Seq[Msg]) extends Grp
case class TypeA(value: Int) extends Ele[Int]
case class TypeB(value: String) extends Ele[String]
case class TypeC(value: Float) extends Ele[Float]
case class MyGrp (list:Seq[Msg]) extends Grp
object Demo extends App{
val grp1 = MyGrp(Seq(TypeA(2)))
val grp2 = MyGrp(Seq(TypeB("ABC"), TypeC(20)))
val s=MyGrp(Seq(grp1,grp2))
val m = MyMessage(Seq(TypeA(2),s)).toCustString(false)
print(m)
}
更新
我的輸出是!2 !!!! 2 !!!! ABC!20.0!
預計 2!2!ABC!20.0!
任何人都可以請解釋downvote的原因。任何改進 – coder25
在我的電腦上這段代碼已經返回預期的結果 – mkUltra
@mkUltra sry出錯我已經更新了這個問題。我的預期輸出是'2!2!ABC!20.0!' – coder25