Different ways to write singleton in Java - Stack OverflowInitialization on Demand Holder
(IODH) idiom which requires very
little code and has zero
synchronization overhead. Zero, as in
even faster than volatile. IODH
requires the same number of lines of
code as plain old synchronization, and
it's faster than DCL!
IODH utilizes lazy class
initialization. The JVM won't execute
a class's static initializer until you
actually touch something in the class.
This applies to static nested classes,
too. In the following example, the
JLS guarantees (Link->
http://ift.tt/1wzGxaU) the JVM will not
initialize instance until someone
calls getInstance():
static class SingletonHolder {
static Singleton instance = new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.instance;
}
http://ift.tt/1GEOdLYDone
from Public RSS-Feed of Jeffery yuan. Created with the PIXELMECHANICS 'GPlusRSS-Webtool' at http://gplusrss.com http://ift.tt/1wzGxYn
