What are the effects of exceptions on performance in Java?

Question

Question: Is exception handling in Java actually slow?

Conventional wisdom, as well as a lot of Google results, says that exceptional logic shouldn\'t be used for n

Answer 1

My opinion about Exception speed versus checking data programmatically.

Many classes had String to value converter (scanner / parser), respected and well-known libraries too ;)

usually has form

class Example {
public static Example Parse(String input) throws AnyRuntimeParsigException
...
}

exception name is only example, usually is unchecked (runtime), so throws declaration is only my picture

sometimes exist second form:

public static Example Parse(String input, Example defaultValue)

never throwing

When the second ins't available (or programmer read too less docs and use only first), write such code with regular expression. Regular expression are cool, politically correct etc:

Xxxxx.regex(".....pattern", src);
if(ImTotallySure)
{
  Example v = Example.Parse(src);
}

with this code programmers hasn't cost of exceptions. BUT HAS comparable very HIGH cost of regular expressions ALWAYS versus small cost of exception sometimes.

I use almost always in such context

try { parse } catch(ParsingException ) // concrete exception from javadoc
{
}

without analysing stacktrace etc, I believe after lectures of Yours quite speed.

Do not be afraid Exceptions