Kotlin: inherit from a nested Java class
I have these Java classes in a .java file:
public class BaseOuter
public class BaseInner
And I have these Kotlin classes in a .kt file:
class DerivedOuter : BaseOuter()
class DerivedInner : BaseOuter.BaseInner()
This Kotlin code in Android Studio gives me an "Unresolved reference: BaseInner" error. So I can inherit from the BaseOuter class, but deriving from Java's BaseOuter.BaseInner is not syntactically correct (but if I try the same with inheritance from Kotlin classes I get no errors).
Somehow I can't google a same example or the question.
java inheritance kotlin nested
asked Nov 14 '18 at 23:23
Emil KabirovEmil Kabirov
217
add a comment |
I have these Java classes in a .java file:
public class BaseOuter
public class BaseInner
And I have these Kotlin classes in a .kt file:
class DerivedOuter : BaseOuter()
class DerivedInner : BaseOuter.BaseInner()
This Kotlin code in Android Studio gives me an "Unresolved reference: BaseInner" error. So I can inherit from the BaseOuter class, but deriving from Java's BaseOuter.BaseInner is not syntactically correct (but if I try the same with inheritance from Kotlin classes I get no errors).
Somehow I can't google a same example or the question.
java inheritance kotlin nested
asked Nov 14 '18 at 23:23
Emil KabirovEmil Kabirov
217
1
For one thing, this doesn't work, because you have an inner class in Java but a static member class in Kotlin. For a class to be inner in Kotlin, you need to mark it with theinnerkeyword:inner class DerivedInner ...
– Erwin Bolwidt
Nov 14 '18 at 23:34
@ErwinBolwidt thanks
– Emil Kabirov
Nov 14 '18 at 23:42
You're welcome. I didn't think it would solve it (because the error says it can't resolve the reference which doesn't sound like the problem I mentioned) and I didn't have time to try it. Hence only a comment
– Erwin Bolwidt
Nov 15 '18 at 0:15
add a comment |
I have these Java classes in a .java file:
public class BaseOuter
public class BaseInner
And I have these Kotlin classes in a .kt file:
class DerivedOuter : BaseOuter()
class DerivedInner : BaseOuter.BaseInner()
This Kotlin code in Android Studio gives me an "Unresolved reference: BaseInner" error. So I can inherit from the BaseOuter class, but deriving from Java's BaseOuter.BaseInner is not syntactically correct (but if I try the same with inheritance from Kotlin classes I get no errors).
Somehow I can't google a same example or the question.
java inheritance kotlin nested
asked Nov 14 '18 at 23:23
Emil KabirovEmil Kabirov
217
I have these Java classes in a .java file:
public class BaseOuter
public class BaseInner
And I have these Kotlin classes in a .kt file:
class DerivedOuter : BaseOuter()
class DerivedInner : BaseOuter.BaseInner()
This Kotlin code in Android Studio gives me an "Unresolved reference: BaseInner" error. So I can inherit from the BaseOuter class, but deriving from Java's BaseOuter.BaseInner is not syntactically correct (but if I try the same with inheritance from Kotlin classes I get no errors).
Somehow I can't google a same example or the question.
java inheritance kotlin nested
java inheritance kotlin nested
asked Nov 14 '18 at 23:23
Emil KabirovEmil Kabirov
217
asked Nov 14 '18 at 23:23
Emil KabirovEmil Kabirov
217
edited Nov 14 '18 at 23:28
Emil Kabirov
asked Nov 14 '18 at 23:23
Emil KabirovEmil Kabirov
217
asked Nov 14 '18 at 23:23
Emil KabirovEmil Kabirov
217
asked Nov 14 '18 at 23:23
Emil KabirovEmil Kabirov
217
217
1
For one thing, this doesn't work, because you have an inner class in Java but a static member class in Kotlin. For a class to be inner in Kotlin, you need to mark it with theinnerkeyword:inner class DerivedInner ...
– Erwin Bolwidt
Nov 14 '18 at 23:34
@ErwinBolwidt thanks
– Emil Kabirov
Nov 14 '18 at 23:42
You're welcome. I didn't think it would solve it (because the error says it can't resolve the reference which doesn't sound like the problem I mentioned) and I didn't have time to try it. Hence only a comment
– Erwin Bolwidt
Nov 15 '18 at 0:15
add a comment |
1
For one thing, this doesn't work, because you have an inner class in Java but a static member class in Kotlin. For a class to be inner in Kotlin, you need to mark it with theinnerkeyword:inner class DerivedInner ...
– Erwin Bolwidt
Nov 14 '18 at 23:34
@ErwinBolwidt thanks
– Emil Kabirov
Nov 14 '18 at 23:42
You're welcome. I didn't think it would solve it (because the error says it can't resolve the reference which doesn't sound like the problem I mentioned) and I didn't have time to try it. Hence only a comment
– Erwin Bolwidt
Nov 15 '18 at 0:15
1
1
For one thing, this doesn't work, because you have an inner class in Java but a static member class in Kotlin. For a class to be inner in Kotlin, you need to mark it with the
inner keyword: inner class DerivedInner ...– Erwin Bolwidt
Nov 14 '18 at 23:34
For one thing, this doesn't work, because you have an inner class in Java but a static member class in Kotlin. For a class to be inner in Kotlin, you need to mark it with the
inner keyword: inner class DerivedInner ...– Erwin Bolwidt
Nov 14 '18 at 23:34
@ErwinBolwidt thanks
– Emil Kabirov
Nov 14 '18 at 23:42
@ErwinBolwidt thanks
– Emil Kabirov
Nov 14 '18 at 23:42
You're welcome. I didn't think it would solve it (because the error says it can't resolve the reference which doesn't sound like the problem I mentioned) and I didn't have time to try it. Hence only a comment
– Erwin Bolwidt
Nov 15 '18 at 0:15
You're welcome. I didn't think it would solve it (because the error says it can't resolve the reference which doesn't sound like the problem I mentioned) and I didn't have time to try it. Hence only a comment
– Erwin Bolwidt
Nov 15 '18 at 0:15
add a comment |
1 Answer
1
active
oldest
votes
The equivalent of Java's non-static nested class in Kotlin is inner class.
To make your code work, you need to use inner keyword:
class DerivedOuter() : BaseOuter()
inner class DerivedInner : BaseOuter.BaseInner()
answered Nov 14 '18 at 23:41
syntagmasyntagma
12.9k1250106
add a comment |
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1 Answer
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The equivalent of Java's non-static nested class in Kotlin is inner class.
To make your code work, you need to use inner keyword:
class DerivedOuter() : BaseOuter()
inner class DerivedInner : BaseOuter.BaseInner()
answered Nov 14 '18 at 23:41
syntagmasyntagma
12.9k1250106
add a comment |
The equivalent of Java's non-static nested class in Kotlin is inner class.
To make your code work, you need to use inner keyword:
class DerivedOuter() : BaseOuter()
inner class DerivedInner : BaseOuter.BaseInner()
answered Nov 14 '18 at 23:41
syntagmasyntagma
12.9k1250106
add a comment |
The equivalent of Java's non-static nested class in Kotlin is inner class.
To make your code work, you need to use inner keyword:
class DerivedOuter() : BaseOuter()
inner class DerivedInner : BaseOuter.BaseInner()
answered Nov 14 '18 at 23:41
syntagmasyntagma
12.9k1250106
The equivalent of Java's non-static nested class in Kotlin is inner class.
To make your code work, you need to use inner keyword:
class DerivedOuter() : BaseOuter()
inner class DerivedInner : BaseOuter.BaseInner()
answered Nov 14 '18 at 23:41
syntagmasyntagma
12.9k1250106
answered Nov 14 '18 at 23:41
syntagmasyntagma
12.9k1250106
answered Nov 14 '18 at 23:41
syntagmasyntagma
12.9k1250106
answered Nov 14 '18 at 23:41
syntagmasyntagma
12.9k1250106
12.9k1250106
add a comment |
add a comment |
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1
For one thing, this doesn't work, because you have an inner class in Java but a static member class in Kotlin. For a class to be inner in Kotlin, you need to mark it with the
innerkeyword:inner class DerivedInner ...– Erwin Bolwidt
Nov 14 '18 at 23:34
@ErwinBolwidt thanks
– Emil Kabirov
Nov 14 '18 at 23:42
You're welcome. I didn't think it would solve it (because the error says it can't resolve the reference which doesn't sound like the problem I mentioned) and I didn't have time to try it. Hence only a comment
– Erwin Bolwidt
Nov 15 '18 at 0:15