Inheritance, Interfaces, and Exceptions

Question 1

You will use the keyword _____ to apply *inheritance* from a parent to a child class.

Answer 1

extends

Question 2

What is the definition of inheritance?

Answer 2

Inheritance is a well-established programming principle, and PHP makes use of this principle in its object model. This principle will affect the way many classes and objects relate to one another.

Question 3

How can I access the static method “getMaker()”?

Answer 3

static::getMaker();

Question 4

What is the proper way to access a parent property named “price”?

Answer 4

parent::price

Question 5

You use the keyword _____ to use an interface on an class.

Answer 5

implements

Question 6

What are object inferfaces?

Answer 6

Object interfaces allow you to create code which specifies which methods a class must implement, without having to define how these methods are handled.

Question 7

Code Challenge

Answer 7

class Trout extends Fish {
 public $species;

 function \_\_construct($name, $flavor, $record, $species) {
 parent::\_\_construct($name, $flavor, $record);
 $this-\>species = $species;
 }

public function getInfo() {
$output = “{$this->species} {$this->common_name} tastes {$this->flavor}.”;
$output .= “The record ($this->species} {$this->common_name} weighed {$this->record_weight}.”;
return $output;
}
}

$brook\_trout = new Trout("Trout", "Delicious", "14 pounds 8 ounces", "Brook");
echo $brook\_trout-\>getInfo();