On Wednesday 10 March 2004 17:25, Nathan Toone wrote:
> First question: Are most KDE applications written in C or C++?
C++
> Second question: What is the difference? (if there is any)
C++ is a language with very similar syntax to C and in large parts code can be
used interchangeably.
C++ supports object oriented programming and some other very nice things like
templates (which the newest Java version tries to copy by it Generics)
> Third question: Would you reccommend using the Java Bindings in
> kdebindings to write applications (this would work for new applications,
> just not to change existing applications)? Or is this not a reccommended
> way of developing applications?
You could write new applications but not change C++ applications.
But using the Qt and KDE bindings for Java gets you close to the workings of
their C++ origins, so it might be possible to change C++ code after learning
some C++ basics.
If you are interested in KDE Java development, there is a kde-java mailinglist
IIRC.
> going the other way...and I know there have to be similarities. For
> example, in java you say new Object(), or whatever, and in C++ you do
> something wierd (from looking at the code) like Object::Instance~($qstring,
No, in C++ it is
new ClassName()
as well.
> Basically, I'm looking for the C++ equivalents of java's import,
> constructors, method declaration and calls, etc. Since I think in java,
> I'd like to use it as a jumping off point.
Imports are done by two things.
One is the #include statement, which makes a declaration available to the
compiler and one is a linker directive to make the implementation known to
the linker.
Usually you only have to care about the #include at the beginning, because you
will mostly use classes from the libs commonly linked by the build framework.
Constructors basically work the same as in Java, a difference is that you have
to use the name of the base class instead of super() if you want to use a
specific version of the base class's constructors because a C++ class can
have more than one base class
Methods declarations are similar as well.
In C++ you can put the implementation outseide the class declaration (usually
in a separate file) or inline like in Java.
Example:
Java
public class Test
{
public Test() {
m_number = 0;
}
public Test(int n) {
m_number = n;
}
public int number() {
return m_number;
}
private int m_number;
}
C++
class Test
{
public:
Test() {
m_number = 0;
}
Test(int n) {
m_number = n;
}
int number() {
return m_number;
}
private:
int m_number;
};
If the implementation were not inline it would look like this
class Test
{
public:
Test();
Test(int n);
int number();
private:
int m_number;
};
Test::Test()
{
m_number = 0;
}
Test::Test(int n)
{
m_number = n;
}
int Test::number()
{
return m_number;
}
Cheers,
Kevin
--
Kevin Krammer <kevin.krammer@xxxxxx>
Qt/KDE Developer, Debian User
www.mrunix.de - Unix/Linux programming forum
www.qtforum.org - Qt programming forum
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