Hands-On Object-Oriented Programming with Kotlin

Property-overriding

Kotlin also allows us to override class properties to provide new definitions. Overriding the property is similar to overriding the function: the property must be declared as open in the parent class and the override keyword must be used in the child class to make sure that the property is being overridden explicitly and not accidentally.

Property-overriding is possible in the following cases:

• Immutable properties can be overridden by immutable properties
• Immutable properties can be overridden by mutable properties
• Mutable properties can be overridden by mutable properties

We can override the val properties with either the val or var properties, and we can override the var properties with other var properties, but ...