11 scala 伴生对象之apply方法

在scal的伴生对象中，可以通过apply来实现类名加参数的方式来创建对象

object ApplyDemo {
  def main(args: Array[String]): Unit = {
    val list = List(1,2,3)
    println(list)

    val pig = new Pig("xiaohua")
    // 使用apply来创建对象
    val pig1 =  Pig("小花")
    val pig2 =  Pig()

    println("pig1.name=" + pig1.name) //heizhu
    println("pig2.name=" + pig.name) // xiaohua

  }
}

class  Pig(pName:String){
  var name:String = pName
}

object Pig{
  // 编写一个apply
  def apply(pName: String): Pig = new Pig(pName)

  def apply(): Pig = new Pig("小黑")
}