PHP應用
<?php
date_default_timezone_set("PRC");
/**
 * 1. 類的定義以class關鍵字開始,后面跟著這個類的名稱.類的名稱命名通常每個單詞的第一個字母大寫.
 * 2. 定義類的屬性
 * 3. 定義類的方法
 * 4. 實例化類的對象
 * 5. 使用對象的屬性和方法
 */
class Human{
 public $name;
 public $height;
 public $weight;
public function eat($food){
 echo $this->name."'s eating ".$food."<br/>";
 }
}
class Animal{
 public $kind;
 public $gender;
}
class NbaPlayer extends Human{
 // 類的屬性的定義
public $name="Jordan";// 定義屬性
public $height="198cm";
 public $weight="98kg";
 public $team="Bull";
 public $playerNumber="23";
 private $age="44";
 public $president="David Stern";
 // 類的方法的定義
public function changePresident($newP){
 $this->president=$newP;
 }
 public function run() {
 echo "Running<br/>";
 }
public function jump(){
 echo "Jumping<br/>";
 }
 public function dribble(){
 echo "Dribbling<br/>";
 }
 public function shoot(){
 echo "Shooting<br/>";
 }
 public function dunk(){
 echo "Dunking<br/>";
 }
 public function pass(){
 echo "Passing<br/>";
 }
 public function getAge(){
 echo $this->name."'s age is ".$this->age;
 }
 function __construct($name, $height, $weight, $team, $playerNumber){
 print $name . ";" . $height . ";" . $weight . ";" . $team . ";" . $playerNumber."\n";
 $this->name = $name; // $this是php里面的偽變量,表示對象自身
$this->height = $height; // 通過$this可以設置對象的屬性值
$this->weight = $weight;
 $this->team = $team;
 $this->playerNumber = $playerNumber;
 }
}
/**
 * 1. 類實例化為對象時使用new關鍵字,new之后緊跟類的名稱和一對括號.
 * 2. 使用對象可以像使用其他值一樣進行賦值操作
 */
$jordan = new NbaPlayer("Jordan", "198cm","98kg","Bull","23");echo "<br/>";
$james=new NbaPlayer("James", "203cm", "120kg", "Heat", "6");echo "<br/>";
// 拜訪對象的屬性使用的語法是->符號,后面跟著屬性的名稱
echo $jordan->name."<br/>";
// 調用對象的某個方法使用的語法是->符號,后面跟著方法的名稱和一對括號
$jordan->run();
$jordan->pass();
//子類調用父類的方法
$jordan->eat("apple");
//試著調用private,直接以及通過內部的public函數
//$jordan->age;
$jordan->getAge();echo "<br/>";
$jordan->changePresident("Adam Silver");
echo $jordan->president."<br/>";
echo $james->president."<br/>";
 直接從上述例子開始吧.
這里想得到的是,把兩位對象的某一個變量同時變掉.――用static
public static $president="David Stern";
 // 類的方法的定義
public static function changePresident($newP){
static::$president=$newP;//這里static換成self更符合規范
}

PHP應用
echo NbaPlayer::$president;echo "<br/>";
NbaPlayer::changePresident("Adam Silver");
echo NbaPlayer::$president;echo "<br/>";

PHP應用
class BaseClass{
 public function test(){
 echo "BaseClass::test called<br/>";
 }
public function test1(){
 echo "BaseClass::test1 called<br/>";
 }
}
class ChildClass extends BaseClass{
 public function test(){
 echo "ChildClass::test called<br/>";
 }
}
$obj=new ChildClass();
$obj->test();

PHP應用
//具體對象,連接到接口
class Human implements ICanEat{
public function eat($food){
 echo "Human eating ".$food.".<br/>";
 }
}
$obj=new Human();
$obj->eat("shit");

PHP應用
interface ICanEat{
 public function eat($food);
}
//具體對象,連接到接口
class Human implements ICanEat{
public function eat($food){
 echo "Human eating ".$food.".<br/>";
 }
}
class Animal implements ICanEat{
 public function eat($food){
 echo "Animal eating ".$food.".<br/>";
 }
}
$obj=new Human();
$obj->eat("shit");
$monkey=new Animal();
$monkey->eat("banana");

PHP應用
interface ICanPee extends ICanEat{
 public function pee();
}
class Demon implements ICanPee{
 public function pee(){
 echo "Can demon pee?";
 }
 public function eat($food){
 echo "Can demon eat ".$food;
 }
}
$ghost=new Demon();
$ghost->pee();
$ghost->eat("shit");