Inheritance and abstraction

In MCFPP, class support supports Inheritance and abstraction.

Inheritance

Use keyword : can declare a class is inherited from another class. Use keyword super, subclasses can visit parent class’s attributes and methods. Use keyword override can rewrite parent class’s method.

class Parent{
    protect int a;
    func test(){
        print("Parent");
        print(a);
    }
}

class Child: Parent{
    int b;
    override func test(){
        print("Child");
        print(super.a);
    }
}

Abstraction

Use keyword abstract can define an abstract class or an abstract method. You can declare an abstract function in an abstract class, and the subclass must achieve the abstract function. Abstract functions have no method body, only have method abstraction.

abstract class A{
    abstract func test();
}

class B: A{
    override func test(){
        print("Hello, World!");
    }
}