Java 等效于 Kotlin class 与超类构造函数调用

Question

class FirstFragment : Fragment(R.layout.fragment_first){
}

I am new to android app development. I was trying to learn how to do a few things and I haven't studying Kotlin yet, how would I turn this small piece of code into the java class?

public class FirstFragment {
    
}

Answer 1

This is the Java version of your code:

public class FirstFragment extends Fragment {

    public FirstFragment() {
        super(R.layout.fragment_first);
    }

}

You inherit from Fragment with the extends keyboard and then you call the alternate constructor (the one with the layout parameter) from your default constructor.