passing args to new thread

[stormbind]

Hi,

Can I pass arguments to a new thread when the run() method is called?

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[stefanwagner]

No.
You don't call run () yourself, but start ().
So you don't have any influence on how run is called.

So can you pass arguments to start ()?
No, because the methodsignature has to be met - else it is a different method.

Is that a problem?
No, because you may pass arguments in your constructor or create a config/setup-method, to pass your arguments.


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[stormbind]

Yup, go it

With an deprecation error that Xlint cannot comment on. I first used new Thread(myCode).start() and that's fine.

It's for an editor that compiles and launches some java in a new window (referred to as the preview operation). Implementing runnable allows me to continue using my editor without closing the preview window

However, using the preview a second time results in two preview windows, then three, four, etc.

So, I would to exit the preview before launching a new one.

if(preview != null) preview.destroy(); // <-- suspect
preview = new Thread(myCode);
preview.start();

The editor starts. It launches the first preview, and a second preview causes it to hang

So... I think destroy() is a problem and javac gave me a deprecated warning that Xlint could not expand on. Any ideas?

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[stormbind]

Oops! I told a fib.. it causes a long delay, then launches a second preview. Any ideas?

 

[stefanwagner]

A deprecation is not fine - not for new code you wrote just yesterday.

The java-docs tell you why not to use it.

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[stormbind]

As join() is not suitable for my scenario, does it mean java cannot stop a thread?

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[stefanwagner]

You can stop a thread.

Demo 1 (somehow restricted):

public void run ()
{
   // starts
   // stops by itself
}
// all over now

do it yourself:
Demo 2:

private volatile boolean condition = true;

public void stopThread ()
{
    condition = false;
}

public void run ()
{
   while (condition) 
   {
       // do your thing
   }
   // stop and over
}

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