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+# 练习
+
+```php
+//1、写一段代码，定义一个汽车类，有品牌与价格两种属性。并为类实例化对象，为对象的属性赋值并引用。
+<?php
+
+class Car
+{
+private $brand;
+private $price;
+
+function __construct($brand,$price){
+    $this->brand=$brand;
+    $this->price=$price;
+}
+function run(){
+    echo "一辆".$this->price."元的".$this->brand;
+}
+
+    /**
+     * @return mixed
+     */
+    public function getBrand()
+    {
+        return $this->brand;
+    }
+
+    /**
+     * @param mixed $brand
+     */
+    public function setBrand($brand)
+    {
+        $this->brand = $brand;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getPrice()
+    {
+        return $this->price;
+    }
+
+    /**
+     * @param mixed $price
+     */
+    public function setPrice($price)
+    {
+        $this->price = $price;
+    }
+
+}
+$car=new Car("法拉利",99999999);
+$car->run();
+```
+
+```php
+//2、在上例的基础上为汽车类定义一个子类——跑车类。为子类实例化对象并访问父类的属性。
+<?php
+class Roadster extends Car{
+    function __construct($brand,$price){
+         parent::__construct($brand,$price);
+}
+    function running(){
+          echo "这是一辆价格为".parent::getPrice()."元的品牌为".parent::getBrand()."的跑车。";
+    }
+}
+$p=new Roadster("劳斯莱斯",199999999);
+$p->running();
+```
+
+```php
+//3、定义一个类，分别定义3个公共的属性和方法，3个受保护的属性和方法，3个私有属性和方法。
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/17
+ * Time: 17:17
+ */
+
+class Dog
+{
+    //公共属性
+    public $name;
+    public $age;
+    public $sex;
+    //公共方法
+    public function eat(){
+        echo "会吃";
+    }
+    public function run(){
+        echo "会跑";
+    }
+    public function sleep(){
+        echo "会睡觉";
+    }
+
+    //被保护属性
+    protected $color;
+    protected $variety;
+    protected $character;
+    //被保护方法
+    public function cry(){
+        echo "会哭";
+    }
+    public function talk(){
+        echo "会说话";
+    }
+    public function tongue(){
+        echo "会吐舌头";
+    }
+
+    //私有属性
+    private $characters;
+    private $weight;
+    private $height;
+
+    /**
+     * @return mixed
+     */
+    public function getCharacters()
+    {
+        return $this->characters;
+    }
+
+    /**
+     * @param mixed $characters
+     */
+    public function setCharacter($characters): void
+    {
+        $this->character = $characters;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getWeight()
+    {
+        return $this->weight;
+    }
+
+    /**
+     * @param mixed $weight
+     */
+    public function setWeight($weight): void
+    {
+        $this->weight = $weight;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getHeight()
+    {
+        return $this->height;
+    }
+
+    /**
+     * @param mixed $height
+     */
+    public function setHeight($height): void
+    {
+        $this->height = $height;
+    }
+```
+