Threads ???

[Soumy Kumar]

 Given the code
 
1public class ThreadDemo extends Thread{
2   public void run(){
3System.out.println("Thread Started");
4//What Code ??????
5        System.out.println("Done");
6   }
7   public static void main(String[] arg){
8ThreadDemo td = new ThreadDemo();
9td.start();
10   }
11}
 
Which of the following given code segment(s) below can be placed at line 4 to print both "Thread Started" and "Done" to the standard output.
 

 

A.suspend(); resume();
 
B.sleep(10000);
 
C.yield();
 
D.yield(); resume();
 
E.All the above
 
 

I picked B and C

but answer is C and D

Is it that sleep() needs to be in a try catch block...so its not right to be inserted in line 4 ??
and how about D answer..I don't have idea..

help needed ..

bye

[trivikram Kumar]

My view is that..when yield is called in the thread..the control is given to the main thread and since there is nothing to be performed in the main thread..the yielded thread will resume as per JVM and then DONE is printed.
The same is interpreted in answer D.

[Animesh Shrivastava]

In my opinion C should be the only answer.
Since resume() is deprecated in 1.4, i dont get convinced by D.
Well, are such questions expected in SCJP for which the answers contain deprecated methods? Please anyone already given SCJP reply to this?


Thanks

[ramaseshan T]

I didn't see any deprecated methods in the choices and there was no questions on that. But you might get question on what are the deprecated methods in Java 1.4?

-----------------------------
Thanks,
Ramaseshan
SCJP 1.4

[Jay Pawar]

Originally posted by ramaseshan T:
But you might get question on what are the deprecated methods in Java 1.4?

I do not think so. SCJP objectives do not mention that.

[Jeroen Wenting]

You're not supposed to know the deprecated methods for the exam at all so they won't appear as options in any answer.

[Mike Gershman]

I didn't see any deprecated methods in the choices

From j2SE 1.4.2 API doc:

resume()
Deprecated. This method exists solely for use with suspend(), which has been deprecated because it is deadlock-prone.

Many of the SCJP mock exams were written before the suspend/resume methods were deprecated. I don't think you will see any reference to deprecated methods on the real SCJP 1.4 exam because I did not see them in the exam objectives.