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notify vs notifyAll

P Ventura
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Joined: Jan 24, 2007
Posts: 42
Please, someone clarify differences between notify and notifyAll.
I can't understand, they're similar!


Objective: SCJP 1.5<br /><a href="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html" target="_blank" rel="nofollow">API</a><br /> <blockquote><font size="1" face="Verdana, Arial">code:</font><hr><pre><font size="2"><br />Double n1 = Double.NaN; Double n2 = Double.NaN;<br /> n1.equals(n2) // true even though Double.NaN != Double.NaN<br />-0.0 == +0.0; // true<br />Double n1 = -0.0;Double n2 = +0.0;<br />n1.equals(n2) // false even though -0.0 == +0.0<br /></font></pre><hr></blockquote>
Kelvin Chenhao Lim
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Joined: Oct 20, 2007
Posts: 513
More than one thread can wait on an object at any given time. When you call an object's notify() method, only one of those waiting threads will be woken (and you can't choose which one). On the other hand, if you call an object's notifyAll() method, all of those waiting threads will be woken.


SCJP 5.0
 
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