I have classes that are automatically generated in Java. I want to add a method to that class (in another file) so that I can add additional functionality without changing the generated file. The idea being that if I have to recreate the generated file, I won't lose my new functionality.
In Objective-c I know this is called categories, and in JavaScript you can append the object's prototype, but I am unaware of how to do this in Java or what it is called.
This is not supported in java.
partial classes/partial class file
One thing you can do is inherit the generated class (if it is not final) and add your methods.
You could just use composition, ie:
public class JasonString {
String wrapped;
public JasonString() {
wrapped = new String();
}
public String toString() {
return wrapped.toLowerCase().toString();
}
// other methods of wrapped class you're using should just call the corresponding method in wrapped.
}
If you do not have access to the generated class you could try to extend it (if generated class is not final) and add new methods to sub-class... Java doesn't support dynamic attributes as JavaScript.
I agree with @Itay I used to have auto-generated classes from Ibatis and the best way to go about with your problem is to extend all the generated classes and add the functionality that you want.
