scala之样例类

scala样例类

代码

//样例类
object CaseDemo {
  def main(args: Array[String]): Unit = {
    //定义样例类
    //构造函数的参数默认是public
    case class Message( var sender:String,recipient:String ,body:String)
      //创建样例类的对象
      val messagel=Message("Jerry","Tom","Hello")
      println("sender:"+messagel.sender)
      println("recipient:"+messagel.recipient)
      messagel.sender="Bob"//sender使用var修饰时可以输出
      println("sender2:"+messagel.sender)
      //messagel.recipient="sss"//recipient默认使用val修饰
  }
}

结果

sender:Jerry
recipient:Tom
sender2:Bob

Process finished with exit code 0