what is the benefit of having an object of interface itself declare inside the interface for kotlin
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1
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for example
An interface of
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
object EMPTY : StateInterface
}
then its been declared inside an actionbean like this
open val stateInterface: StateInterface = StateInterface.EMPTY
Is it all it does it just create a new interface? Why we need to do it this way?
oop kotlin interface
asked Nov 19 at 19:11
Ezeewei
2,28032659
add a comment |
up vote
1
down vote
favorite
for example
An interface of
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
object EMPTY : StateInterface
}
then its been declared inside an actionbean like this
open val stateInterface: StateInterface = StateInterface.EMPTY
Is it all it does it just create a new interface? Why we need to do it this way?
oop kotlin interface
asked Nov 19 at 19:11
Ezeewei
2,28032659
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
for example
An interface of
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
object EMPTY : StateInterface
}
then its been declared inside an actionbean like this
open val stateInterface: StateInterface = StateInterface.EMPTY
Is it all it does it just create a new interface? Why we need to do it this way?
oop kotlin interface
asked Nov 19 at 19:11
Ezeewei
2,28032659
for example
An interface of
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
object EMPTY : StateInterface
}
then its been declared inside an actionbean like this
open val stateInterface: StateInterface = StateInterface.EMPTY
Is it all it does it just create a new interface? Why we need to do it this way?
oop kotlin interface
oop kotlin interface
asked Nov 19 at 19:11
Ezeewei
2,28032659
asked Nov 19 at 19:11
Ezeewei
2,28032659
asked Nov 19 at 19:11
Ezeewei
2,28032659
asked Nov 19 at 19:11
Ezeewei
2,28032659
asked Nov 19 at 19:11
Ezeewei
2,28032659
2,28032659
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
3
down vote
accepted
You don't need to do it that way.
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
}
object EMPTY : StateInterface
Would work fine, but the author decided that they wanted the usage to read StateInterface.EMPTY and not just EMPTY.
One advantage or reason for choosing this way is that EMPTY appears in the code completion after typing StateInterface. making it easier to find.
Another readability advantage is that anyone who references StateInterface.EMPTY does not need an additional import line which they would if it wasn't a nested object.
import com.example.StateInterface
val x = StateInterface.EMPTY
This bit open val stateInterface: StateInterface = StateInterface.EMPTY is a property on an object. It's open so descendant implementations can override it. If they do not, StateInterface.EMPTY will be the value of this property.
answered Nov 19 at 19:17
weston
38.8k1695165
1
And perhaps a third advantage is that you can have another interface with its own EMPTY member, without a clash of names.
– gidds
Nov 19 at 23:48
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
accepted
You don't need to do it that way.
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
}
object EMPTY : StateInterface
Would work fine, but the author decided that they wanted the usage to read StateInterface.EMPTY and not just EMPTY.
One advantage or reason for choosing this way is that EMPTY appears in the code completion after typing StateInterface. making it easier to find.
Another readability advantage is that anyone who references StateInterface.EMPTY does not need an additional import line which they would if it wasn't a nested object.
import com.example.StateInterface
val x = StateInterface.EMPTY
This bit open val stateInterface: StateInterface = StateInterface.EMPTY is a property on an object. It's open so descendant implementations can override it. If they do not, StateInterface.EMPTY will be the value of this property.
answered Nov 19 at 19:17
weston
38.8k1695165
1
And perhaps a third advantage is that you can have another interface with its own EMPTY member, without a clash of names.
– gidds
Nov 19 at 23:48
add a comment |
up vote
3
down vote
accepted
You don't need to do it that way.
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
}
object EMPTY : StateInterface
Would work fine, but the author decided that they wanted the usage to read StateInterface.EMPTY and not just EMPTY.
One advantage or reason for choosing this way is that EMPTY appears in the code completion after typing StateInterface. making it easier to find.
Another readability advantage is that anyone who references StateInterface.EMPTY does not need an additional import line which they would if it wasn't a nested object.
import com.example.StateInterface
val x = StateInterface.EMPTY
This bit open val stateInterface: StateInterface = StateInterface.EMPTY is a property on an object. It's open so descendant implementations can override it. If they do not, StateInterface.EMPTY will be the value of this property.
answered Nov 19 at 19:17
weston
38.8k1695165
1
And perhaps a third advantage is that you can have another interface with its own EMPTY member, without a clash of names.
– gidds
Nov 19 at 23:48
add a comment |
up vote
3
down vote
accepted
up vote
3
down vote
accepted
You don't need to do it that way.
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
}
object EMPTY : StateInterface
Would work fine, but the author decided that they wanted the usage to read StateInterface.EMPTY and not just EMPTY.
One advantage or reason for choosing this way is that EMPTY appears in the code completion after typing StateInterface. making it easier to find.
Another readability advantage is that anyone who references StateInterface.EMPTY does not need an additional import line which they would if it wasn't a nested object.
import com.example.StateInterface
val x = StateInterface.EMPTY
This bit open val stateInterface: StateInterface = StateInterface.EMPTY is a property on an object. It's open so descendant implementations can override it. If they do not, StateInterface.EMPTY will be the value of this property.
answered Nov 19 at 19:17
weston
38.8k1695165
You don't need to do it that way.
interface StateInterface {
val variationTypes: List<VariationType>
get() = emptyList()
}
object EMPTY : StateInterface
Would work fine, but the author decided that they wanted the usage to read StateInterface.EMPTY and not just EMPTY.
One advantage or reason for choosing this way is that EMPTY appears in the code completion after typing StateInterface. making it easier to find.
Another readability advantage is that anyone who references StateInterface.EMPTY does not need an additional import line which they would if it wasn't a nested object.
import com.example.StateInterface
val x = StateInterface.EMPTY
This bit open val stateInterface: StateInterface = StateInterface.EMPTY is a property on an object. It's open so descendant implementations can override it. If they do not, StateInterface.EMPTY will be the value of this property.
answered Nov 19 at 19:17
weston
38.8k1695165
edited Nov 19 at 19:22
answered Nov 19 at 19:17
weston
38.8k1695165
answered Nov 19 at 19:17
weston
38.8k1695165
answered Nov 19 at 19:17
weston
38.8k1695165
38.8k1695165
1
And perhaps a third advantage is that you can have another interface with its own EMPTY member, without a clash of names.
– gidds
Nov 19 at 23:48
add a comment |
1
And perhaps a third advantage is that you can have another interface with its own EMPTY member, without a clash of names.
– gidds
Nov 19 at 23:48
1
1
And perhaps a third advantage is that you can have another interface with its own EMPTY member, without a clash of names.
– gidds
Nov 19 at 23:48
And perhaps a third advantage is that you can have another interface with its own EMPTY member, without a clash of names.
– gidds
Nov 19 at 23:48
add a comment |
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