Scala学习笔记

1 闭包

     var a = 3

     var addfun = (x:Int) => x + a

     var b = addfun(10)

     println(b)

　　

addfun 就是个和对象无关的函数，局部变量，使用方法和函数一样，但是好像不推荐这种写法。


2 类的创建，简单使用

abstract class BParent{

  def testoverride()

}



// 构造函数参数会自动生成类字段,如果不加val则为私有字段, 类外无法访问

class B( val name : String, val age:Int) extends  BParent{

  var namebak:String=_ // 初始化

  val cname = "classname is B"



  // 附属构造器, C++ 重载构造函数

  def this(name: String, age: Int, namebak: String){

    this(name, age)

    println("call this " + name)

    this.namebak = namebak

  }



  def testoverride(): Unit ={

    println("my class name is B")

  }

}



class BSon(name: String, age: Int, addr: String) extends B(name, age){

  println("Bson is Create")





  override val cname = "classname is BSon"



  override def toString = "BSon toString "  + super.toString



  override  def testoverride(): Unit ={

    println("my class name is BSon")

  }

}

　　

　　调用

val b = new B("test", 32, "dd")
println(b.name)
println(b.namebak)
println(b.toString)

var bson = new BSon("bsonname", 1, "bsonaddr")
println(bson.toString)
println(bson.cname)
bson.testoverride()

 

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