PHP 之高级OOP特性

1.对象克隆

 1 <?php 
 2     header("Content-type:text/html; charset=utf-8");
 3 
 4     #在对象前面加关键字clone来克隆对象
 5     class Animal{
 6         private $age;
 7         private $sex;
 8 
 9         #为age定义一个设置方法与一个获取方法
10         function setAge($age){
11             $this->age = $age;
12         }
13 
14         function getAge(){
15             return $this->age;
16         }
17 
18     }
19 
20     #创建新的Animal对象
21     $dog1 = new Animal();
22     $dog1->setAge("23");
23 　　 
24     $dog2 = clone $dog1;
25     $dog2->setAge("45");
26 
27     printf("dog1 age:%d <br>",$dog1->getAge());
28     printf("dog2 age:%d <br>",$dog2->getAge());
29 
30 /*    输出
31     dog1 age:23 
32     dog2 age:45 */

 

2.继承与接口

<?php 
    header("Content-type:text/html; charset=utf-8");

    #接口中所有方法必须实现,倘若实现类没有实现所有方法,则必须声明为抽象类
    interface IPillage{
        function emptyBankAccount();
        function burnDocuments();
    }

    #父类
    class Employee{
        private $name;

        #构造函数
        function __construct($name){
            $this->setName($name);
        }


        function setName($name){
            if($name == "")
                echo "Name cannot be blank!";
            else
                $this->name = $name;
        }

        function getName(){
            return "My name is ".$this->name."<br>";
        }
    }

    class Executive extends Employee implements IPillage{

        #定义一个特有的方法
        function pillageCompany(){
            echo "i'am selling company !";
        }

        #接口实现
        function emptyBankAccount(){
            echo "hello";
        }

        function burnDocuments(){
            echo "world";
        }
    }

    class CEO extends Executive{
        function __construct($name){
            #当遇到parent::__construct()时,PHP开始沿着父类向上搜索合适的构造函数
            parent::__construct($name);
            echo "<p>CEO object creat!</p>";

            #显示引用构造函数
            #Employee::__construct($name);
        }


        function getFacelift(){
            echo "nip nip tuck tuck";
        }
    }




/*    $exec = new Executive();
    $exec->setName("Lily");

    echo $exec->getName();
    echo $exec->pillageCompany();

    输出:
    My name is Lily
    i'am selling company !*/

/*    $ceo = new CEO();
    $ceo->setName("Jack");
    $ceo->pillageCompany();
    $ceo->getFacelift();*/

    #子类实例化时会执行父类构造函数
    $ceo = new CEO("Dennis");
    echo $ceo->getName();
View Code

 3.抽象类

(1)抽象类是不能被实例化的类,只能由其他基类继承

(2)抽象类中定义的所有方法必须在子类中实现

posted on 2017-11-25 03:40  xjxhxhl  阅读(184)  评论(0)  编辑  收藏  举报

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