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kotlinlang

Hi guys, I'm having trouble understanding the difference between these:

With abstract class:
```
abstract class ParentObject(val id: Int)
class ChildObject(id: Int, val value: String) : ParentObject(id)
```

With adt/sealed class it doesn't compile:
```
sealed class ParentObject(val id: Int)
data class ChildObject(id: Int, val value: String) : ParentObject(id)
```

Is there any way to get it working in Kotlin? I want the benefits of the data classes but there are some fields that are common for all my subtypes.

```
sealed class ParentObject {
    abstract val id: Int
}
data class ChildObject(override val id: Int, val value: String) : ParentObject()
```

Thank you for your quick reply- I was trying to follow the compiler error and use   the "overriding" somewhere :slightly_smiling_face: but I couldn't get it to work.