scala_apply函数

scala apply方法

class ApplyOperation{

}

class ApplyTest{
	def apply() = println("I am into spark so much!")
	def haveTry: Unit ={
		println("have a try on apply")
	}
}

object ApplyTest{
	def apply() ={
		println("I am into Scala so much")

		new ApplyTest
	}
}

object ApplyOperation{
	def main(args : Array[String]){
		val array = Array(1,2,3,4)

		val a = ApplyTest()// 调用object 的apply

		a.haveTry

		a() // class apply use
	}
}

输出
I am into Scala so much
have a try on apply
I am into Spark so much!!!

参考
scala apply方法 笔记
动手实战Scala中的apply方法和单例对象

scala case class apply

Scala会给case类自动添加一个单例对象

参考探索Scala（4）– Case Classes