Question about threads in Kathy's Book.I don't understand.

[Daniel Faria]

   
public class Messanger implements Runnable{
publi static void main(String [] args){
new Thread(new Messenger("Wallace"));
new Thread(new Messenger("Gromit"));
}
private String name;
public Messenger(String name){ this.name=name }
}
public void run(){
message(1);
message(2)
}
private syncronized void message(int n){
System.out.println(name+ "-"+n+"")

 }
}

This correct answer in book is Wallace-1 Gromit-1 Gromit-2 Wallace-2, but i don't understand if two
threads have differents instances. How know what showing??

Thanks.

[Ulf Dittmer]

That code will not output anything, because the threads are never started. Are you sure that this is the code the question is about?

[Daniel Faria]

Sorry, this is wrong.
A correct code is:

 
public class Messanger implements Runnable{   
publi static void main(String [] args){   
new Thread(new Messenger("Wallace")).start();   
new Thread(new Messenger("Gromit")).start();   
}   
private String name;   
public Messenger(String name){ this.name=name }   
}   
public void run(){   
message(1);   
message(2)   
}   
private syncronized void message(int n){   
System.out.println(name+ "-"+n+"")   
  
 }   
}  
 

I forget put start method.
Thanks.

[Punit Singh]

This code guarantees only one thing that is: Wallace-1 will come before Wallace-2 and Gromit-1 will come before Gromit-2.

Now Wallace and Gromit can come in any order. So you have to pick answer from the order that code is guaranting.

[Daniel Faria]

I understand, find this question in enghish version of book.There isn't.
Thanks.

[nav katoch]

Hi Br Java,

Is Java your last name or just for fun? If not, then please use real name.

Thanks,

Naveen

[Jesper de Jong]

"Br Java", please check your private messages. You can see them by clicking My Private Messages.