Pattern: Unnecessary abstract class
Issue: -
In case an abstract class does not have any concrete members it should be refactored into an interface. Abstract classes which do not define any abstract members should instead be refactored into concrete classes.
Example of incorrect code:
abstract class OnlyAbstractMembersInAbstractClass { // violation: no concrete members
abstract val i: Int
abstract fun f()
}
abstract class OnlyConcreteMembersInAbstractClass { // violation: no abstract members
val i: Int = 0
fun f() { }
}