OOP (course 3): Inheritance, Abstract Classes, Interfaces and other amazing things

Abstract Classes

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Challenge 3 / 3

Look at the following code written by your trusty colleague:

abstract class AbstractShip
{
    // ...
}

class EmpireShip extends AbstractShip
{
    // ...
}

class RebelShip extends AbstractShip
{
    // ...
}

function clearTakeoff(AbstractShip $thing)
{
    // ...
}

Why might your colleague have chosen to use the AbstractShip type hint in the clearTakeoff() function?

To prevent any usage of the clearTakeoff() function with specific ship types, like EmpireShip or RebelShip.

To make the clearTakeoff() function inaccessible to all instances except the AbstractShip instance.

To make sure that only instances of the AbstractShip class can be passed to the function.

To allow any subclass of AbstractShip, such as EmpireShip and RebelShip, to be used as an argument in the function.

Rewatch the video