please explain this

[payal sharma]

class Process
{
   Process()
   { 
     write();
   }
    
   void write() 
   { 
     System.out.println(Thread.activeCount());
   }
}
class Test extends Process
{
   public static void main(String[] args)
   {
     Process t = new Test();
   }
   public void write()
   {
     System.out.println(Thread.interrupted());
   }
}
till this point is clear as the object is of typw Test so write method of Test is called but if
class Process
{
   Process()
   { 
     write();
   }
    
   private void write() 
   { 
     System.out.println(Thread.activeCount());
   }
}
class Test extends Process
{
   public static void main(String[] args)
   {
     Process t = new Test();
   }
   public void write()
   {
     System.out.println(Thread.interrupted());
   }
}

then write method of process is called why?
please explain
payal
[This message has been edited by payal sharma (edited July 27, 2001).]

[Ragu Sivaraman]

Payal,
Thats what private's do!! They are soo picky
Well let see,
In the eariler case you had modifiers for both the write() methods as friendly/coderanch. So during Dynamic Invocation, write()from subclass gets called satisfying the polymorphic effect.
But
When you make the parent write() private, dynamic invocation
fails because privates are very personal, and they would not share it with anybody else, even to their subclasses and these two write()methods become independent of each other. As as result, write() from parent gets called, since
you had used parent's class reference in the first place
To put it in a nut shell:
private methods behaviour is closely similar to static when it comes to overriding.
Thankyou

[Vedhas Pitkar]

Good explaination private meths do behave as static .
If u want more info there is a good example at www.absolutejava.com

[Desai Sandeep]

Just be careful on 2 points :

1. private methods are not overriden
   
2. the method of the current object is invoked.
   

Hope this helps,
Sandeep
SCJP2, OCSD(Oracle JDeveloper), OCED(Oracle Internet Platform)