2 Questions on StringBuffer

[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.

Rémi