object test extends App{

  val fun1=(x:Int,y:Int)=>x+y
 
 val fun2=((x:Int,y:Int)=>x+y)
 
 val fun3=(_:Int)+(_:Int)
 
 val fun4:(Int,Int)=>Int=(_+_)
 
 val fun5:(Int,Int)=>Int=(x,y)=>x+y
 
 val fun6=new Function2[Int,Int,Int]{
 override def apply(x: Int, y: Int): Int = if(x<y) x else y
 }
 
 val fun7=(x:Int,y:Int)=>if(x<y) x else y
 
 //無參函式,小括號不能省
 val fun8=()=>println("haha")
 fun8()
}