aspose file tools
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes Threads Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "Threads" Watch "Threads" New topic


Sherry Jacob
Ranch Hand

Joined: Jun 29, 2005
Posts: 128
Hi Every1,
I made these two programs for extends the Thread class and the other implements the Runnable interface.

Both the programs work fine but theres 1 thing I could not understand :

Program-1 prints the name of the thread as ThreadClass while Program-2 prints java.lang.Thread. I was expecting it to print RunnableThreadClass !!

Why's that so ?

Please help. What should I do so that it prints RunnableThreadClass ?


<strong><br />Cheers !!<br /> <br />Sherry<br /></strong><br />[SCJP 1.4]
Arul Prasad
Ranch Hand

Joined: Jan 20, 2005
Posts: 57
hi getClass() is the method of Object class which returns the class name
in ur second prog u r saying

here object t is belongs to Thread class thats why ur getting the java.lang.Thread.and the other point is ur RunnableThreadClass was implementing the Runnable interface it is not a Type of Thread ....

in your first prog ur calling simply

getClass() -> which is nothing but this.getClass() inside the class
thats why ur getting the output as ThreadClass...

hope u got clear

With Regards<br />Arul
Sherry Jacob
Ranch Hand

Joined: Jun 29, 2005
Posts: 128
No I did not understand !! Please clarify further.
Barry Gaunt
Ranch Hand

Joined: Aug 03, 2002
Posts: 7729
Referring to your second example: t is a Thread object. You created it in your constructor.

On the other hand, in the run() method, this is a reference to the Runnable object not the Thread object. That is, this is a reference to an instance of your RunnableMethodClass.

Ask a Meaningful Question and HowToAskQuestionsOnJavaRanch
Getting someone to think and try something out is much more useful than just telling them the answer.
It is sorta covered in the JavaRanch Style Guide.
subject: Threads