Companion class companion object in Scala description __spark

1, the code is as follows:

[Java]  View plain  copy  print? package com.yy.oop     /**   *  associated class and associated objects    * class  Student is the companion of the associated object object student    * object student is the companion object of the associated class class student      */        //Associated class    Class student (Var name:string,var  address:string) {          private var phone= " "     //directly accesses the private members of the associated object      def infocompobj ()  = println (" Companion object in companion class: " + student.sno"   }     //Companion object    object  student {          private var sno:int = 100      def incrementsno () ={               sno += 1 //Plus 1       sno  //return sno     }     def main (args: array[string)):  Unit = {              println ("Single Case object: " + student.incrementsno ())  //single Case object                //instantiate associated class        val obj = new student ("yy", "BJ")        obj.infocompobj ();     }  }  

2. The results are as follows

[plain] view plain copy print? Single Case object: 101 Associated Class Access companion object: 101
3. Scala apply

[Java] view plain copy print?     Package Com.yy.oop/** * Companion Class and companion Object * Class student is the companion of object student associated class * Object student is associated with class student //Companion Class Student (var Name:string,var address:string) {private var phone= "110"///Direct access to associated objects Private member Def infocompobj () = println ("Access companion object in companion class: + Student.sno)}"