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The Java Specialists' Newsletter
Issue 069b2003-05-02
Category:
Performance
Java version: Results of last surveyby Dr. Heinz M. Kabutz
This is a quick follow-up to let you know the score of
the survey from the last newsletter.
In the newsletter I mentioned that i += n is the same
as i = (type_of_i)(i + n). A number of readers were
surprised that I should mention such an obvious bit of information
in an advanced Java newsletter. They were in the minority. Only
32 of the responses indicated that they already knew that information,
and a staggering 174 readers responded that they did not know.
That comes to only 15.53% of Java Specialists knowing about
this. Imagine how few Java beginners know about this?
The quote was attributed to Ralph Waldo Emerson.
Beno Patrik from CLEVERLANCE wrote,
suggesting that we could add the cast from
int to double
to the formula. That would mean that i += n is
the same as i = (type_of_i)((type_of_n)i + n),
if n is of higher precision than i.
I did realise that when I was writing the newsletter, but did
not want to muddy the waters. That is a typical upcast that
we would expect. The one that I mentioned was a downcast,
losing precision, and that we would not expect without a
compiler error.
I have found a great free site
for preparing online for the SCJP examination.
Yesterday, Andrew Righthouse and I spent the public holiday
updating the "Feeding the 5000" webpage. We've added new pictures, and Andrew
explained a bit more about what the people of the townships
experience daily. South Africa is a concentrated example of the
sufferings of this
world. Less than 10km away from where I live is poverty where
people live below the breadline. Visitors who come to South Africa
are disturbed about this; that some should live in
big houses, drive fancy cars, and others in the same town would
be starving. It is dreadful, a legacy of an evil system that
will take years to right. Yet the contrast that is so evident in
South Africa is a picture of the suffering of the whole world.
We have rich countries and poor countries. They are perhaps
separated by 1000's of kilometers, but that does not make the
poor nations disappear. They are still there, whether you like
it or not.
Heinz
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