Question about thread

[mohamed ewis]

hi
please help answering the following question

What must be true for the RunHandler class so that instances of RunHandler can be used as written
in the code below?

class Test
{
public static void main(String[] args)
{
Thread t = new Thread(new RunHandler());
t.start();
}
}

choose 2 only
(A) RunHandler must implement the java.lang.Runnable interface
(B) RunHandler must extend the thread class
(C) RunHandlermust provide a run method declared as public and returning
(D) RunHandler must provide an init() method

i say a and b correct

[Vijay Raj]

Yeah, you are right.

regards,
vijay.

[Henry Wong]

No. RunHandler must be a Runnable object. It does not have to extend from the Thread class.

Henry

[mohamed ewis]

hi henry

if i create class that extend thread i can throw it as thread parameter
as you give him a runnable object is not true ?

[Henry Wong]

Originally posted by mohamed ewis:
hi henry

if i create class that extend thread i can throw it as thread parameter
as you give him a runnable object is not true ?

Yes. The Thread class implements the Runnable interface, so if you extend from the Thread class, your new class can be used as the Runnable parameter in the Thread class constructor.

But you don't have to do that... You can just create a class that extends the Object class, and implement the Runnable interface.

Choice B states that you *must* extend the thread class, and that is not true.

Henry

[Edwin Dalorzo]

However the answers are not mutually exclusive. Either a or b would be correct.

The class could implement Runnable or it could extend Thread, and, finally, though completely illogical, it is possible to extend Thread and implement Runnable at the same time.

So, as far as I can see, the answer is correct.

[Asha Pathik]

Hi all,

Isn't RunHandlermust provide a run method declared as public and returning this option right.

Plz explain
Asha