Am 17.03.2010 17:36, schrieb Rémi Forax:
Le 17/03/2010 17:29, Ulf Zibis a écrit :
Why there are 2 methods which do not use the super method, where I
can't see any difference? :
public synchronized char charAt(int index)
public synchronized void setCharAt(int index, char ch)
Wouldn't ensureCapacity better coded as follows? :
public void ensureCapacity(int minimumCapacity) {
if (minimumCapacity > value.length) synchronized {
ensureCapacity(minimumCapacity);
}
}
This would save the synchronization if there is nothing to do.
-Ulf
no, it doesn't work.
if some variables are not in the synchronized block,
they can be updated by one thread but this change will be not visible
in another thread.
Hm, those values are checked again in the super.ensureCapacity(), so
inside the synchronized block.
I guess this is the answer on my 2nd question, thanks.
Please excuse little typo, I meant:
super.ensureCapacity(minimumCapacity);
-Ulf
