throw checked exception from inner thread

[dhoni Gibson]

Hi all,

i have to throw checked exception from child thread to its parent thread. since run() method doesnt allow us to throw exception out of it, i am stuck here, please help me how to handle this situation.

i want to know whether the logic inside the child thread has been completed successfully or not.


Thanks in advance
dhoni

[Edward Harned]

There is no parent/child relationship with threads; each is an independent entity.

You can pass a shared Class to the second thread. When the second thread completes, it can update the shared Class as to its status. The first thread can then get that status.

[dhoni Gibson]

hi ed,

thanks for you reply. can you please explain me with an example. i believe that you want me to pass the shared class to the thread ( being invoked ) through its costructor.


Thanks
dhoni

[Edward Harned]

MySharedClass msc = new MySharedClass();
OtherThread ot = new OtherThread(msc);
ot.start();

[William Brogden]

You don't pass data to Threads, you pass data to objects, presumably Runnable object attached to a Thread which is executing methods in the object.

Bill

[dhoni Gibson]

hi ed/william,

Thanks for your reply . i have few questions for you

i have runnable class to which i can pass my shared class through constructor. just for my knowledge , william please let me know why cant we use thread instead of runnable class. do you have any specific reason to use runnable object.

in addition i have one more question to all.. instead of passing whole class to the another thread; can i pass simple variable so that i get the status say 'success' or 'failure'.



Thanks
dhoni

[Edward Harned]

You don't pass a whole class, just a reference to the class.

Primitives are passed by copy, so you can't update one and have it reflected in the calling thread. Therefore, you need to pass a reference to something that both threads can see. An array is a form of object so you can pass say:
int[] pass = new int[1];
pass[0] = 0;
Now the other thread can set the first int to 1 when it is done.

[Naveen Madarapu]

@dhoni Gibson

i have runnable class to which i can pass my shared class through constructor. just for my knowledge , william please let me know why cant we use thread instead of runnable class. do you have any specific reason to use runnable object.

Remember that runnable is not a class it is an interface.

[dhoni Gibson]

thanks for all your reply. naveen i meant to say class that implements runnable interface. i apoligize for not making it clear.