I have created an interface on kotlin.
interface IDataManager{
val dataType: String?
}
Now I am trying to get its variable in my java class, like following.
public static DataWrapper getInstance(IDataManager iDataManager) {
dataType= iDataManager.dataType;
return instance;
}
But I am getting error: cannot find symbol iDataManager.dataType
Please call getter function to get a value of the variable:
dataType = iDataManager.getDataType();
If we use properties on Kotlin side we should use getters and setters to access those properties on Java side.
edit - as Alexey points out in the comments, this doesn't work for interfaces, since the property needs a backing field and properties in interfaces can't have those. It's still useful to know, but it doesn't apply to the OP's question
As well as what Sergey said, you can add the @JvmField annotation on things if you want to expose them as a field instead of generating the getters and setters
interface IDataManager{
@JvmField val dataType: String?
}
@JvmStatic is another useful one for Java interop, you can put it on properties and functions in companion objects, so instead of this
Utils.Companion.coolUtility()
you can do this (like you're used to)
Utils.coolUtility()
@JvmField won't work on an interface property, because interfaces can't have instance fields.