import scala.collection.mutable.ArrayBuffer

import scala.collection.mutable.Buffer

object ArrayLearning {

  def main (args: Array[String]): Unit = {

//    useZipUnzip

//    listOps

//    arrayOps

//    ArrayBufferOps

  }

  private def useZipUnzip = {

    //zip and unzip

    val nums = List(1, 2, 3, 4)

    val chars = List('a', 'b', 'c', 'd')

    val combinList = nums.zip(chars)

    println(combinList)

    println(combinList.unzip)

  }

  private def ArrayBufferOps = {

    //创建可变数组

    val strArrayVar = ArrayBuffer[String]()

    //在尾部添加元素

    strArrayVar += "aaa"

    println(strArrayVar)

    strArrayVar += ("bbb","ccc")

    println(strArrayVar)

    //追加任意集合

    strArrayVar ++= List("ddd", "eee")

    println(strArrayVar)

    //删除尾部3个元素

    strArrayVar.trimEnd(3)

    println(strArrayVar)

    //可变和不可变数组转换

    val arr: Array[String] = strArrayVar.toArray

    val arrBuffer: Buffer[String] = arr.toBuffer

  }

  private def arrayOps = {

    //创建定长数组

    val numberArray = new Array[Int](10)

    val stringArray = new Array[String](10)

    //数组赋值

    stringArray(0) = "hello"

    println(stringArray(0))

    //用Array apply方法创建数组

    val strArray = Array("aaa", "bbb")

  }

  private def listOps = {

    val xss = List(List(1,2,3),List("a","b","c"))

    val fList: List[Any] = xss.flatten

    println(fList)

    println(List.concat(List(1,2,3),List(4,5,6)))

    println(List(1,2,3):::List(4,5,6):::Nil)

  }

}