泛型应用场景

package test40

class Pair[T](var x: T, var y: T)

object test {
  def main(args: Array[String]): Unit = {
    val p1 = new Pair(1,2)
    val p2 = new Pair[Double](1.0, 2.0)
    val p3 = new Pair[String]("大陆", "长空")
  }
}