class Student {

   val mySayHello1: String => Unit = sayHello

   val mySayHello2: (String, Int) => Unit = sayHello

   val myTalkTo = talkTo _

   val myJumpStart: () => String = jumpStart

   def sayHello(name: String) = {

     println("Hello 1, " + name)

   }

   def sayHello(name: String, age: Int) = {

     println("Hello 2, " + name + "," + age)

   }

   def talkTo(name: String, age: Int): Unit = {

     println("Talk to , " + name + "," + age)

   }

   def jumpStart(): String = {

     "Start to Jump"

   }

 }

 object FunctionDemo {

   def main(args: Array[String]): Unit = {

     val s = new Student()

     //操作标记法调用方法

     s sayHello "bill"

     //操作标记法调用方法

     s sayHello ("bill", 20)

     //函数类型赋值

     s.sayHello("bill")

     s.sayHello("bill", 20)

     //用通配符为函数赋值

     s.myTalkTo("bill", 10)

     //无输入参数函数赋值

     println(s.myJumpStart())

   }

 }

Hello 1, bill
Hello 2, bill,20
Hello 1, bill
Hello 2, bill,20
Talk to , bill,10
Start to Jump