class Ball
{
public function play()
{
}
}
class Football extends Ball
{
public function play()
{
echo "play football<hr/>";
}
}
class Basketball extends Ball
{
public function play()
{
echo "play basketball<hr/>";
}
}
class Job
{
public function __construct(Ball $ball)
{
$ball->play();
}
}
new Job(new Football()); //play football
new Job(new Basketball()); //play basketball
多态就是运行时确定调用的是哪个实例的方法
上面的例子中,play方法因传入的实例不同打印出了不同的结果.这就是多态的体现
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