java - How a sleeping thread can send interrupt to itself? -


i reading java threads. looking sleep() method. books states that

when thread encounters sleep call, must go sleep specified amount of time, unless interrupted before wake-up time.

i reading interrupts, how can thread send interrupt itself? think thread can send interrupt? understanding correct? additionally, both of threads, 1 send interrupt should having same target runnable? if suppose thread interrupted, go runnable state? sorry, if sounding stupid, it's pretty new me. thanks

a thread can't interrupt while sleeping, because is... sleeping.

a picture worth thousand words here simple example thread starts sleeping , main thread interrupts it:

public static void main(string[] args) throws exception {     runnable sleeper = new runnable() {         public void run() {             try {                 system.out.println("sleeper going sleep");                 thread.sleep(1000);                 system.out.println("sleeper awake");             } catch (interruptedexception e) {                 system.out.println("sleeper got interrupted");             }         }     };      thread t = new thread(sleeper);     t.start(); //run sleeper in own thread     thread.sleep(500); //sleeping in main little make sure t started     t.interrupt(); }

which prints:

sleeper going sleep sleeper got interrupted

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