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suspend()

 
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Hi!
I found in a mock exam:
public class ThreadTest extends Thread {
public void run() {
System.out.println("In run");
suspend();
resume();
System.out.println("Leaving run");
}

public static void main(String args []) {
(new ThreadTest()).start();
}}

A - Compilation will fail in the method main.
B - Compilation will fail in the method run.
C - A warning will be generated for method run.
D - The string "In run" will be printed to standard out.
E - Both strings will be printed to standard out.
F - Nothing will happen.
The answer is D but why is not E??
Thanks in advanced
 
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Jordi
Only the first string will be printed out because right after it prints it it calls the suspend method and stops running. There is no way for it to get to and call the resume method because it is suspended. The code will print the first string to the screen then just hang.
Hope that helps
Dave
by the way keep in mind that both suspend and resume are deprecated and are not on the test. You should focus on the newer thread controls (wait, notify, notifyAll, yield)
 
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First of all, suspend() and resume() are deprecated as of Java 2, so they shouldn't show up on the exam.
Second: A suspended thread can only be resumed from another thread.
The reason the code doesn't print "Leaving run" is because the thread is never resumed and that SOP statement is never reached. For that matter, resume() is never reached because a thread can't resume itself. The control comes from outside the thread.
April
 
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The resume() statment would never be executed in the code snipplet posted.Hence we donot see the second statement in the output.
Also, make use of wait() and notify() instead of suspend() and resume().The latter methods are deprecated and prone to deadlock.Refer to the API docs for more information on why these methods are deprecated.
-- Sandeep
SCJP2, OCSD(Oracle JDeveloper), OCED(Oracle Internet Platform)
[This message has been edited by Desai Sandeep (edited July 28, 2001).]
 
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