[Multi-threading] Will this code cause problem? (run & main exist in the same class)

[Haitao]

Hi all,

I just saw a code fragment written by someone as follows:

public class MyThread extends Thread
{
public void run()
{
... (do something)
}

public static void main(String[] args)
{
Thread t= new MyThread ();
t.start();
... (do something)
}
}

I am new to Java multi-threading program, and haven't seen such a coding
style. Will putting run() and main() in the same class and executing this
class cause some unexpected problems?

Thanks!

 

[Andreas Leitgeb]

I just saw a code fragment written by someone as follows:
public class MyThread extends Thread
{
public void run() { ... (do something) }
public static void main(String[] args)
{
Thread t= new MyThread (); t.start(); ... (do something)
}
}
I am new to Java multi-threading program, and haven't seen such a coding
style. Will putting run() and main() in the same class and executing this
class cause some unexpected problems?

No. main and run can peacefully co-exist

What types of problems did you fear? The only potential for
unexpected problems lies in the "... (do something)"-parts

 

[Arne Vajhøj]

I just saw a code fragment written by someone as follows:

public class MyThread extends Thread
{
public void run()
{
... (do something)
}

public static void main(String[] args)
{
Thread t= new MyThread ();
t.start();
... (do something)
}
}

I am new to Java multi-threading program, and haven't seen such a coding
style. Will putting run() and main() in the same class and executing this
class cause some unexpected problems?

Not necessarily.

Impossible to tell based on the available information.

It depends on whether run and main access something in
a thread unsafe manner or not.

Arne