11月30号作业 抽象类与接口

抽象类与接口

<?php
//抽象类
abstract class a{
    public $name;
    public function __construct($name){
        $this->name=$name;
    }
    public function af(){
        echo $this->name;
    }
    //抽象方法不能有内容
    abstract function aff();
}
class b extends a{
    //b继承a后，必须把a里面的抽象方法实现
    public function aff(){
        echo $this->name;
    }
}
$a =new b('张三');
$a->af();

<?php
//接口
interface ivehicle{
    const CUNTRY='中国';
    public function setFuel($fuel);
    public function setPurpose($purpose);
}
//接口不可以有普通方法，不可以有成员变量
class car implements ivehicle{
    public $fuel;
    public $purpose;
    public function __construct($fuel='汽油',$purpose='家用'){
        $this->fuel=$fuel;
        $this->purpose=$purpose;
    }
    public function setFuel($fuel){
        $this->fuel=$fuel;
    }
    public function setPurpose($purpose){
        $this->purpose=$purpose;
    }
    public function getInfo(){
        return $this->fuel . $this->purpose . '车<br>';
    }
}
$car=new Car();
echo $car->getInfo();
$car->setFuel('新能源');
$car->setPurpose('公交');
echo $car->getInfo();