Calling A Super Class Constructor in Scala
Prerequisite – Scala Constructors
In Scala, Constructors are used to initialize an object’s state and are executed at the time of object creation. There is a single primary constructor and all the other constructors must ultimately chain into it. When we define a subclass in Scala, we control the superclass constructor that is called by its primary constructor when we define the extends portion of the subclass declaration.
- With one constructor: An example of calling a super class constructor
Geeksforgeeks Subclass constructor called
- In the above example, the subclass is defined to call the primary constructor of the GFG class, which is a single argument constructor that takes message as its parameter. When defining a subclass in Scala, one controls the Superclass constructor that’s called by the Subclass’s primary constructor when defining the extends segment of the Subclass declaration.
- With multiple constructors : In a case with the Superclass having multiple constructors, any of those constructors can be called using the primary constructor of the Subclass. For Example, in the following code, the double argument constructor of the Superclass is called by the primary constructor of the Subclass using the extends clause by defining the specific constructor.
Article count 3000 Subclass constructor called
- We can call the single argument constructor here, By default another argument value will be 0.
Article Count 0 Subclass constructor called