과제2 제출합니다 #21
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과제2 제출합니다 #21
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| import android.widget.TextView | ||
| import androidx.recyclerview.widget.RecyclerView | ||
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| class GenreAdapter(private var genres: List<Genre>) : RecyclerView.Adapter<GenreAdapter.GenreViewHolder>() { |
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val 변수는 초기화 후에 다른 객체를 할당하려하면 컴파일에러를 내줘서 실수할 일이 줄어듭니다!
Java에서 final 변수라고 생각하시면 돼요
많은 경우에 var 대신 val 쓰시는 걸 추천합니다
| return 4 | ||
| } | ||
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| inner class CustomViewHolder(view: View) : RecyclerView.ViewHolder(view) { |
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inner class와 static nested class의 차이점이 무엇일까요?
inner class는 외부 클래스를 참조합니다. 아마 CustomViewHolder에서 별다른 코드를 추가하지 않아도 자동으로 TapAdapter의 프로퍼티를 참조하실 수 있으셨을 거예요
외부 클래스가 GC되지 않아 메모리 누수가 발생할 수 있습니다
Java는 키워드를 붙여야 static nested class인데, Kotlin에서는 키워드를 붙이면 inner class예요 반대입니다!
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