Unable to access member from inherited java class outside in kotlin
I am very new to Kotlin, I was trying to migrate my java project to kotlin and I ran into a problem where I can't access implicit inherited members from my class.
In java I had a class called Robot.java which extends from TimedRobot.java and inside the TimedRobot.java there is a static member which is a double type
public class Robot extends TimedRobot {
}
TimedRobot.java from the library:
public class TimedRobot extends IterativeRobotBase {
public static final double DEFAULT_PERIOD = 0.02;
private double m_period = DEFAULT_PERIOD;
...
}
In the same package as the Robot.java I have a class called RobotConstants.java which holds some numbers. Even though there was no variable called DEFAULT_PERIOD in my Robot class I was still able to call it from outside like this:
public class RobotConstants {
public static final int PERIOD_IN_MS = (int)(Robot.DEFAULT_PERIOD * 1000);
...
}
However I am not able to do that in kotlin.
My robot class in kotlin:
class Robot : TimedRobot() {
}
And I am unable to get the default period in my constants object in kotlin, it gives me a compile time error. Here is what I am trying to do:
object RobotConstants {
const val PERIOD_Ms = (Robot.DEFAULT_PERIOD * 1000).toInt()
...
}
java inheritance kotlin
asked Jan 2 at 7:48
Mahim AribMahim Arib
33
add a comment |
I am very new to Kotlin, I was trying to migrate my java project to kotlin and I ran into a problem where I can't access implicit inherited members from my class.
In java I had a class called Robot.java which extends from TimedRobot.java and inside the TimedRobot.java there is a static member which is a double type
public class Robot extends TimedRobot {
}
TimedRobot.java from the library:
public class TimedRobot extends IterativeRobotBase {
public static final double DEFAULT_PERIOD = 0.02;
private double m_period = DEFAULT_PERIOD;
...
}
In the same package as the Robot.java I have a class called RobotConstants.java which holds some numbers. Even though there was no variable called DEFAULT_PERIOD in my Robot class I was still able to call it from outside like this:
public class RobotConstants {
public static final int PERIOD_IN_MS = (int)(Robot.DEFAULT_PERIOD * 1000);
...
}
However I am not able to do that in kotlin.
My robot class in kotlin:
class Robot : TimedRobot() {
}
And I am unable to get the default period in my constants object in kotlin, it gives me a compile time error. Here is what I am trying to do:
object RobotConstants {
const val PERIOD_Ms = (Robot.DEFAULT_PERIOD * 1000).toInt()
...
}
java inheritance kotlin
asked Jan 2 at 7:48
Mahim AribMahim Arib
33
1
The static constants defined on a super type won't be accessible on the sub type in Kotlin (as opposed to Java). In your case, you could accessDEFAULT_PERIODonly viaTimedRobot
– s1m0nw1
Jan 2 at 7:57
@s1m0nw1 thats a bummer to hear, but thank you for the clarification!
– Mahim Arib
Jan 2 at 8:04
add a comment |
I am very new to Kotlin, I was trying to migrate my java project to kotlin and I ran into a problem where I can't access implicit inherited members from my class.
In java I had a class called Robot.java which extends from TimedRobot.java and inside the TimedRobot.java there is a static member which is a double type
public class Robot extends TimedRobot {
}
TimedRobot.java from the library:
public class TimedRobot extends IterativeRobotBase {
public static final double DEFAULT_PERIOD = 0.02;
private double m_period = DEFAULT_PERIOD;
...
}
In the same package as the Robot.java I have a class called RobotConstants.java which holds some numbers. Even though there was no variable called DEFAULT_PERIOD in my Robot class I was still able to call it from outside like this:
public class RobotConstants {
public static final int PERIOD_IN_MS = (int)(Robot.DEFAULT_PERIOD * 1000);
...
}
However I am not able to do that in kotlin.
My robot class in kotlin:
class Robot : TimedRobot() {
}
And I am unable to get the default period in my constants object in kotlin, it gives me a compile time error. Here is what I am trying to do:
object RobotConstants {
const val PERIOD_Ms = (Robot.DEFAULT_PERIOD * 1000).toInt()
...
}
java inheritance kotlin
asked Jan 2 at 7:48
Mahim AribMahim Arib
33
I am very new to Kotlin, I was trying to migrate my java project to kotlin and I ran into a problem where I can't access implicit inherited members from my class.
In java I had a class called Robot.java which extends from TimedRobot.java and inside the TimedRobot.java there is a static member which is a double type
public class Robot extends TimedRobot {
}
TimedRobot.java from the library:
public class TimedRobot extends IterativeRobotBase {
public static final double DEFAULT_PERIOD = 0.02;
private double m_period = DEFAULT_PERIOD;
...
}
In the same package as the Robot.java I have a class called RobotConstants.java which holds some numbers. Even though there was no variable called DEFAULT_PERIOD in my Robot class I was still able to call it from outside like this:
public class RobotConstants {
public static final int PERIOD_IN_MS = (int)(Robot.DEFAULT_PERIOD * 1000);
...
}
However I am not able to do that in kotlin.
My robot class in kotlin:
class Robot : TimedRobot() {
}
And I am unable to get the default period in my constants object in kotlin, it gives me a compile time error. Here is what I am trying to do:
object RobotConstants {
const val PERIOD_Ms = (Robot.DEFAULT_PERIOD * 1000).toInt()
...
}
java inheritance kotlin
java inheritance kotlin
asked Jan 2 at 7:48
Mahim AribMahim Arib
33
asked Jan 2 at 7:48
Mahim AribMahim Arib
33
asked Jan 2 at 7:48
Mahim AribMahim Arib
33
asked Jan 2 at 7:48
Mahim AribMahim Arib
33
asked Jan 2 at 7:48
Mahim AribMahim Arib
33
33
1
The static constants defined on a super type won't be accessible on the sub type in Kotlin (as opposed to Java). In your case, you could accessDEFAULT_PERIODonly viaTimedRobot
– s1m0nw1
Jan 2 at 7:57
@s1m0nw1 thats a bummer to hear, but thank you for the clarification!
– Mahim Arib
Jan 2 at 8:04
add a comment |
1
The static constants defined on a super type won't be accessible on the sub type in Kotlin (as opposed to Java). In your case, you could accessDEFAULT_PERIODonly viaTimedRobot
– s1m0nw1
Jan 2 at 7:57
@s1m0nw1 thats a bummer to hear, but thank you for the clarification!
– Mahim Arib
Jan 2 at 8:04
1
1
The static constants defined on a super type won't be accessible on the sub type in Kotlin (as opposed to Java). In your case, you could access
DEFAULT_PERIOD only via TimedRobot– s1m0nw1
Jan 2 at 7:57
The static constants defined on a super type won't be accessible on the sub type in Kotlin (as opposed to Java). In your case, you could access
DEFAULT_PERIOD only via TimedRobot– s1m0nw1
Jan 2 at 7:57
@s1m0nw1 thats a bummer to hear, but thank you for the clarification!
– Mahim Arib
Jan 2 at 8:04
@s1m0nw1 thats a bummer to hear, but thank you for the clarification!
– Mahim Arib
Jan 2 at 8:04
add a comment |
1 Answer
1
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oldest
votes
You can either use the actual TimedRobot.DEFAULT_PERIOD constant or redefine it via a companion object:
class Robot : TimedRobot() {
companion object {
const val DEFAULT_PERIOD = TimedRobot.DEFAULT_PERIOD
}
}
Another possibility is to represent these values as top level fields.
answered Jan 2 at 8:57
tynntynn
20.6k54883
add a comment |
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You can either use the actual TimedRobot.DEFAULT_PERIOD constant or redefine it via a companion object:
class Robot : TimedRobot() {
companion object {
const val DEFAULT_PERIOD = TimedRobot.DEFAULT_PERIOD
}
}
Another possibility is to represent these values as top level fields.
answered Jan 2 at 8:57
tynntynn
20.6k54883
add a comment |
You can either use the actual TimedRobot.DEFAULT_PERIOD constant or redefine it via a companion object:
class Robot : TimedRobot() {
companion object {
const val DEFAULT_PERIOD = TimedRobot.DEFAULT_PERIOD
}
}
Another possibility is to represent these values as top level fields.
answered Jan 2 at 8:57
tynntynn
20.6k54883
add a comment |
You can either use the actual TimedRobot.DEFAULT_PERIOD constant or redefine it via a companion object:
class Robot : TimedRobot() {
companion object {
const val DEFAULT_PERIOD = TimedRobot.DEFAULT_PERIOD
}
}
Another possibility is to represent these values as top level fields.
answered Jan 2 at 8:57
tynntynn
20.6k54883
You can either use the actual TimedRobot.DEFAULT_PERIOD constant or redefine it via a companion object:
class Robot : TimedRobot() {
companion object {
const val DEFAULT_PERIOD = TimedRobot.DEFAULT_PERIOD
}
}
Another possibility is to represent these values as top level fields.
answered Jan 2 at 8:57
tynntynn
20.6k54883
answered Jan 2 at 8:57
tynntynn
20.6k54883
answered Jan 2 at 8:57
tynntynn
20.6k54883
answered Jan 2 at 8:57
tynntynn
20.6k54883
20.6k54883
add a comment |
add a comment |
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1
The static constants defined on a super type won't be accessible on the sub type in Kotlin (as opposed to Java). In your case, you could access
DEFAULT_PERIODonly viaTimedRobot– s1m0nw1
Jan 2 at 7:57
@s1m0nw1 thats a bummer to hear, but thank you for the clarification!
– Mahim Arib
Jan 2 at 8:04