[Htmlparser-developer] Java Performance question

[Somik R. <so...@ya...>]

Hi Folks,
    I was tinkering around with instanceof and under the impression that =
it causes a performance hit, I tried replacing it with a polymorphic =
mechanism - by which HTMLNode has a method getType(), and so do the =
other basic nodes. A match is then attempted like so :
if (node.getType()=3D=3DHTMLTag.TYPE)

instead of

if (node instanceof HTMLTag)

I have taken care that getType does not do object creation - it is a =
static object. One would expect the former to be faster.
But in a performance test (InstanceofPerformanceTest in =
org.htmlparser.tests) - I find the opposite behaviour.
Here's a graph showing the response of instanceof in blue and =
getType()=3D=3DHTMLTag.TYPE in pink -
http://htmlparser.sourceforge.net/design/pics/performance.gif

Does anyone have explanations ?

Regards,
Somik