Re: [twincling] Re: [scala-traits]

[Mukund Deshpande]

Hi Raj,

Sorry for this chain of mails but thought i'd share something.
Now when you read the scala book i thought traits are similar to classes
(pg:245)
But actually traits are Interfaces

trait trait1 {
  def philosophize() {
    println("I consume memory, therefore I am!")
  }
}
//trait a


aven...@linux-fksn:~> javap -private trait1$class
Compiled from "trait1.scala"
public *interface* trait1 extends scala.ScalaObject{
    public abstract void philosophize();
}


and when they run they create a class which implements that interface

aven...@linux-fksn:~> javap -private trait1$class.class
Compiled from "trait1.scala"
public *abstract class* trait1$class extends java.lang.Object{
    public static void $init$(trait1);
    public static void philosophize(trait1);
}

Now

class sms extends trait1{
}
 //class b extends a

aven...@linux-fksn:~> javap -private sms
Compiled from "sms.scala"
public class sms extends java.lang.Object* implements*trait1,scala.ScalaObject{
    public sms();
    public int $tag()       throws java.rmi.RemoteException;
    public void philosophize();

Now i create an object

object k{
def main(args:Array[String]){
val c:trait1=new sms
c.philosophize
}
}

-->"I consume memory therefore i am"
//val c:a=new b

Now

class sms extends trait1{
override def philosophize{
println("I don't use memory")
}
}


Now when you run k object you get
-->"I don't use memory"

As far as your query is concerned the previous post may help you out!!!

thanks,

SMS


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