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chào các anh chị, em mới nhập môn kotlin và gặp phải thắc mắc muốn nhờ anh chị giúp đỡ em tìm được một ví dụ trên mạng như sau: val a: Int = 100 val boxedA: Int? = a val ...
Tại sao code thế này lại báo lỗi ở chỗ abstract ạ: abstract data class Category( var id: Long, var name: String )
