A sentence out of my anticipation!

[Jack Dowson]

Hello Everybody:
Here is a demo to test java's multithread:
class MyThread extends Thread{
public void run(){
while(true){
System.out.println(getName() + " is running!");
try{
sleep(1000);
}catch(InterruptedException e){
System.out.println(e.getMessage());
}
}
}
}
class InterruptThreadDemo{
public static void main(String[] args) throws InterruptedException{
MyThread m = new MyThread();
System.out.println("Starting thread...");
m.start();
Thread.sleep(2000);
System.out.println("Interrupt thread...");
m.interrupt();
Thread.sleep(2000);
System.out.println("Stopping application...");
}
}


The result is:
Starting thread...
Thread-0 is running!
Thread-0 is running!
Interrupt thread...
Thread-0 is running!
sleep interrupted
Thread-0 is running!
Thread-0 is running!
Stopping application...
Thread-0 is running!
Thread-0 is running!
Thread-0 is running!
Thread-0 is running!
Thread-0 is running!
.......


The outcome is bit out of my anticipation:
What happened to create the sentence "sleep interrupted!"

Any help will be greatly appreciated!

 

[Gordon Beaton]

The outcome is bit out of my anticipation:
What happened to create the sentence "sleep interrupted!"

You called m.interrupt() from main(), which resulted in an exception
in thread "m", currently sleeping. The exception contained the message
which you then printed in the catch block in run().

/gordon

--

 

[Jack Dowson]

Gordon Beaton дµÀ:

You called m.interrupt() from main(), which resulted in an exception
in thread "m", currently sleeping. The exception contained the message
which you then printed in the catch block in run().

/gordon

So when we interrupt a sleep thread it will become runnable!
Right?

Thank you!

 

[Jack Dowson]

Gordon Beaton дµÀ:

You called m.interrupt() from main(), which resulted in an exception
in thread "m", currently sleeping. The exception contained the message
which you then printed in the catch block in run().

/gordon

So that means if we interrupt a sleep thread then it will become
runnable,right?

Thank you!

 

[Patricia Shanahan]

Gordon Beaton дµÀ:
So that means if we interrupt a sleep thread then it will become
runnable,right?

Yes, an interrupt ends a sleep etc.

If you want to be sure to sleep for a specified time regardless of
interrupt, you need to keep track of when the sleep is due to end, and
put the sleep in a while loop.

However, it is more usual to send an interrupt to a thread when it
should stop what it is currently doing and do something else.

Patricia

 

[Jack Dowson]

Patricia Shanahan 写é“:

Yes, an interrupt ends a sleep etc.

If you want to be sure to sleep for a specified time regardless of
interrupt, you need to keep track of when the sleep is due to end, and
put the sleep in a while loop.

However, it is more usual to send an interrupt to a thread when it
should stop what it is currently doing and do something else.

Patricia

Thank you so much!