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Programmer Certification (OCPJP)
Question about threads in Kathy's Book.I don't understand.
Daniel Faria
Greenhorn
Posts: 15
posted 15 years ago
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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
Rancher
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posted 15 years ago
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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
Greenhorn
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posted 15 years ago
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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
Ranch Hand
Posts: 952
posted 15 years ago
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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.
SCJP 6
Daniel Faria
Greenhorn
Posts: 15
posted 15 years ago
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I understand, find this question in enghish version of book.There isn't.
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nav katoch
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posted 15 years ago
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Hi Br
Java
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Is Java your last name or just for fun? If not, then please use real name.
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Naveen
Jesper de Jong
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posted 15 years ago
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"Br Java", please check your private messages. You can see them by clicking
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