Java class如何扩展Kotlin库

Question

How can Java class extend Kotlin library?

I understand what all kotlin classes are final.

I have library and I need to override some methods. But then I extend library, I'm getting error

public class Editor extends EditorLibrary //error Cannot inherit from final

Any chances to extend kotlin final class, because I can't change it to open?

Answer 1

If you have control over the library you can open the class for extension using the open keyword, otherwise, as you've mentioned, the class was not built for extensions...

open EditorLibrary(...) {
}

In such case you might consider using composition over inheritance... eg :

public class Editor {
    private final EditorLibrary editor;
    
    ...
}