看看老外是如何理解抽象類的

下面是我翻譯的關于幫助理解抽象類的例子。
?????????? 這是一個例子幫助我們理解抽象類。在我看來這是一個非常簡單的方法。讓我們一起來看看下面的代碼:

<?php     class Fruit {     private $color;     public function eat() {     //chew     }     public function setColor($c) {     $this->color = $c;     }     
}     class Apple extends Fruit {     public function eat() {     //chew until core     }     
}     class Orange extends Fruit {     public function eat() {     //peel     //chew     }     
}     
?>

?現在我給一個蘋果你吃

<?php     $apple = new Apple();     $apple->eat();     
?>

?感覺怎么樣?它嘗起來就像一個蘋果。現在我給一個水果你吃。

<?php     $fruit = new Fruit();     $fruit->eat();     
?>

?吃水果???你能看出它是什么顏色,嘗出是什么味道嗎?感覺是不是怪怪的呢?所以你不能這樣子做。

? ? ? ? ? ?現在讓我們來看一下水果的正確吃法吧。

<?php     abstract class Fruit {     private $color;     abstract public function eat()     public function setColor($c) {     $this->color = $c;     }     
}     
?>

?

現在想想,數據庫和數據庫擴展。此外,一個音符。一個抽象類,就像一個接口,你可以定義一個抽象類中的方法,而它們都是抽象接口。
????????????
?本文首發網志博客,歡迎轉載!轉載請注明本文地址,謝謝。????
?本文地址:http://www.w3note.com/web/42.html

?

轉載于:https://www.cnblogs.com/ewblgo/archive/2013/03/21/2973163.html

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