Abstract class in x++

 -> Abstract classes are identified by the keyword abstract.

->  They cannot be instantiated but require a subclass that is inherited from the abstract class.

-> Abstract classes are used to implement a concept that the subclass will then complete.

-> Abstract methods can also be declared in abstract classes. 

-> Abstract methods do not allow code or declarations in the method.

-> A subclass must extend the abstract class to use the abstract method.


Example:


abstract class Vehicle

{

      str owner;

      int age;


void printInfo()

      {

    Info(strfmt("%1, %2",owner, age));

      }

    abstract void operate() // abstract method 

    {

      //Abstract methods do not allow code or declarations in the method.

    }

 }


Example:


class Car extends Vehicle  // Car is a subclass that extends Vehice (abstract class) to use abstract method called Operate (abstract method name)

{

     str model;

     void printInfo()

     {

            // overriding default functionality

            Info(strfmt("%1, %2, %3",owner, age, model));

     }

   void operate()

   {

        Info('running');

   }

}

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