学习scala笔记--8 scala object

 

 

 

 

scala   Object

 

 

Object 是静态单例的

 

 

scala> :paste

// Entering paste mode (ctrl-D to finish)

 

object Person{

 

var eysNum=2

println("hello")

 

}

 

 

// Exiting paste mode, now interpreting.

 

defined object Person

 

scala> 

 

scala> 

 

scala> Person.eysNum

hello

res1: Int = 2

 

scala> 

 

scala> 

 

scala> Person.eysNum

res2: Int = 2

 

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感觉伴生对象 可以理解为 类的静态辅助工具

 

 

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object  继承  抽象类

 

scala> :paste

// Entering paste mode (ctrl-D to finish)

 

 

abstract class Hello(var message:String){

 

def sayHello(name:String): Unit

}

 

 

object HelloImpl extends Hello("hello"){

 

 override def sayHello(name:String)={

     println(message+","+name)

}

}

 

 

 

// Exiting paste mode, now interpreting.

 

defined class Hello

defined object HelloImpl

 

scala> 

 

scala> 

 

scala> HelloImpl.sayHello("dalic")

hello,dalic

 

 

 

 

 

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 vi hello.scala   增加下面内容

 

object hello{

 

def main(args:Array[String*]){

 

println("hello world")

 

}

 

}

 

 

 

  scalac  hello.scala

  scala Hello gggg 

 显示： hello world

 

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