scala 模式匹配

scala 模式匹配可以匹配多种，包括元组数组集合

package day01
import scala.util.Random
object match1{
  def main(args: Array[String]): Unit = {
      val arr = Array("a","b","c")
      val name = arr(Random.nextInt(arr.length))
      // 匹配字符串
      name match {
        case "a" => println("it is a!")
        case "b" => println("it is b!")
          // _ 表示全部匹配！
        case _ => println("it is nothing!")
      }
      // 匹配类型
      val ar1 = Array("abc",100,12.34,true,match1)
      val el = ar1(Random.nextInt(ar1.length))
      el match {
          case str:String => println(s"match String:$str")
          case int:Int => println(s"match int:$int")
          case bool: Boolean => println(s"match bool:$bool")
          case matchType:MatchType =>
            println(s"match matchType:$matchType")
          case _:Any => println("not match")
      }
    // 匹配数组
    val arr1 = Array(1,2,3,4)
    arr1 match {
        // a,b,c 表示占位符
      case Array(1,a,b,c) => println(s"case: $a,$b,$c")
      case Array(_,x,y,z) => println(s"case: $x,$y $z")
      case _ =>println("Not match ")  // 必须包含默认值！
    }
  }
}
class MatchType{

}