<?php
class Athlete
{
/* ===== 權限示範 ===== */
protected int $stamina; // 子類別可直接調整
private float $salary; // 僅 Athlete 內部知道
protected string $name; // 延續舊範例
protected int $age;
public function __construct(string $name, int $age, float $salary)
{
$this->name = $name;
$this->age = $age;
$this->salary = $salary;
$this->stamina = 100; // 初始體能
}
/* ===== public 介面 ===== */
public function train(): void
{
// 公開方法可使用 private $salary（在本類別裡合法）
$this->decreaseStamina(10);
printf("%s 訓練 1 小時，體能剩餘 %d%%，月薪 %.1f 萬\n",
$this->name, $this->stamina, $this->salary);
}
protected function playGame(): void {
printf("playgame");
}
/* ===== protected 工具 ===== */
// 子類別可以呼叫以消耗或回復體能
protected function decreaseStamina(int $point): void
{
$this->stamina = max(0, $this->stamina - $point);
}
protected function recover(): void
{
$this->stamina = 100;
}
}
/* ---------- 子類別 ---------- */
class VolleyballPlayer extends Athlete
{
// 覆寫，不同項目有不同玩法
public function playGame(): void
{
// 直接操作 protected $stamina
$this->decreaseStamina(30);
printf("%s 扣殺得分！體能剩 %d%%\n", $this->name, $this->stamina);
}
// 額外公開方法示範
public function rest(): void
{
$this->recover();
printf("%s 休息完畢，體能回復到 %d%%\n", $this->name, $this->stamina);
}
}
class BaseballPlayer extends Athlete
{
public function __construct(string $name, int $age, float $salary, public string $position)
{
parent::__construct($name, $age, $salary);
}
// 覆寫，不同項目有不同玩法
public function playGame(): void
{
$this->decreaseStamina(20);
printf("%s (%s) 上場投球，體能剩 %d%%\n",
$this->name, $this->position, $this->stamina);
}
}
$players = [
new VolleyballPlayer('小李', 23, 6.5),
new BaseballPlayer ('小王', 26, 12.0, 'Pitcher'),
];
foreach ($players as $p) {
$p->train(); // 父類別公開方法
$p->playGame(); // 多型
echo "-----\n";
}