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Is it possible to extend multiple classes in Scala.
For example if I have ClassA and ClassB then can ClassC extend ClassA and ClassB (like in C++).
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To extend a class in Scala we use extends keyword. there are two restrictions to extend a class in Scala : To override method in scala override keyword is required. Only the primary constructor can pass parameters to the base constructor.
A Scala class can extend multiple traits at once, but JVM classes can extend only one parent class. The Scala compiler solves this by creating "copies of each trait to form a tall, single-column hierarchy of the class and traits", a process known as linearization.
When one class extends more than one classes then this is called multiple inheritance. For example: Class C extends class A and B then this type of inheritance is known as multiple inheritance.
You can't extend multiple classes, but you can extend several traits. Unlike Java interfaces, traits can also include implementation (method definitions, data members, etc.). There is still a difference in that you can't instantiate a trait directly (similar to abstract classes in a way).
trait T1 trait T2 trait T3 class C extends T1 with T2 with T3 No, ClassC just can extend one of those, but you can mixin multiple traits.
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answered Oct 05 '22 15:10
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