Hello everyone,
I am using JDK 1.4 and there is a compiling a 3rd party program error because of un-recognized word @override. Could anyone let me know what is the function of @override and in order to use it, which version of JDK is required?
thanks in advance,
George
@override is meta-data and should be in a javadoc /** comment field
It is used to indicate what class the overridden method is overridden from.
I thik it was introduced in java 5 and is an annotation type.
Try looking here:
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Override.html
> @override is meta-data and should be in a javadoc /**
> comment field
>
Wrong. Annotations aren't Javadoc entries.
> It is used to indicate what class the overridden
> method is overridden from.
Wrong. It only indicates THAT it's overridden, not what it's overridden from.
Could you provide more information please? Upgrade for what?
regards,
George
Thanks jwenting!
> > It is used to indicate what class the overridden
> > method is overridden from.
>
> Wrong. It only indicates THAT it's overridden, not
> what it's overridden from.
Could you show me a sample please? From java.sun.com, I can not find a sample.
regards,
George
Thanks c0demonk3y,
> I thik it was introduced in java 5 and is an
> annotation type.
>
> Try looking here:
>
> http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Over
> ride.html
Could you show me a sample please? I have read the page you referred, but I can not use it without looking at a sample. :-)
regards,
George
> Could you provide more information please? Upgrade
> for what?
>
>
> regards,
> George
See reply #2. Upgrade to at least Java 5. (JDK 1.5)
Kaj
> Thanks c0demonk3y,
>
> > I thik it was introduced in java 5 and is an
> > annotation type.
> >
> > Try looking here:
> >
> >
> http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Over
>
> > ride.html
>
> Could you show me a sample please? I have read the
> page you referred, but I can not use it without
> looking at a sample. :-)
>
>
> regards,
> George
public class BaseClass {
public void sayHello() {
System.out.println("Hello there!");
}
}
public class ExampleClass extends BaseClass {
@Override
public void sayHello() {
System.out.println("Hi there!");
}
}
Kaj
@Override is an example of an annotation, which is a syntactic feature introduced at Java 1.5. It's not part of the language at 1.4. Therefore you have two choices - comment them out or move to a more recent java environment.
But note a program which has been writtern for 1.5 or 1.6 may well be using other features of it, like enumerated values and generics. So you may get arround the @Override problem and then find you have other, less tractable incompatibility.
@Override is pretty simple, by the way, by annotating a method you are indicating your intent that this method should override a method in a superclass. This gives you a compile time error should you make the all to easy mistake of getting the signature of an overriding method slightly wrong and, as a result, not succeeding in the override and finding that the superclass version is the one that gets called.
