threads

[josephine chen]

If you supply a target object when you create a new Thread, as in:
Thread t = new Thread(targetObject);
What test of instanceof does targetObject have to pass for this to be legal?
Select the one right answer.
a. targetObject instanceof Thread--true
b. targetObject instanceof Object--true
c. targetObject instanceof Applet
d. targetObject instanceof Runnable//true
e. targetObject instanceof String //true
My answers are based on the ctors that are passed
Am i correct???

[Jim Yingst]

No. Look up the constructors that actually exist for Thread.

[josephine chen]

Thread(Runnable )
Thread(String)

a. targetObject instanceof Thread--false
b. targetObject instanceof Object--false
c. targetObject instanceof Applet//false
d. targetObject instanceof Runnable//true
e. targetObject instanceof String //true

I messed up my ctor check previously......

[Sridhar Srikanthan]

targetObject instanceof Object is also true
Sri

[Prem Mander]

Thread t = new Thread(targetObject);
What test of instanceof does targetObject have to pass for this to be legal?
Select the one right answer.
a. targetObject instanceof Thread--true
b. targetObject instanceof Object--true
c. targetObject instanceof Applet
d. targetObject instanceof Runnable//true
e. targetObject instanceof String //true
its true that instanceof object is true may be the compiler wouldnt catch but wouldnt the runtime squak at it ???
well (d) is what i would choose but for argument sake lets continue this

[Sridhar Srikanthan]

Prem,
Object class is great grandfather of everything
It doesnt even complain at runtime.
provided instanceof can targetobject is ofcourse a String or Runnable target. If it is either of the above, then it is also an instanceof Object.
So if String and Runnable can return true for targetObject instanceof, then Object is also correct
Isnt it right or am i missing something ?
Sri