变量声明中的模式匹配

case class Person(name: String, age: Int)
object TestMatchVariable {  
  def main(args: Array[String]): Unit = {    
    val (x, y) = (1, 2)    
    println(s"x=$x,y=$y")      // x=1,y=2
    val Array(first, second, _*) = Array(1, 7, 2, 9)    
    println(s"first=$first,second=$second")       // first=1,second=7 
    val Person(name, age) = Person("zhangsan", 16)    
    println(s"name=$name,age=$age")      // name=zhangsan,age=16
  }
}