4-8-1.php

php电子书

4-8-1.php<br>
组合<br>
<?
class User{
	private $name = "tom";
	public function getName(){
		return $this->name;
	}
}
class Teacher{
	private $lengthOfService = 5; // 工龄	
	public function getLengthOfService(){
		return $this->lengthOfService;
	}
}
// 上面的类中的set方法就不写了.
// 如果有个研究生,既是学生也算工龄. 
class GraduateStudent extends User {
	private $teacher ;
	public function __construct(){
		$this->teacher = new Teacher();		
	}	
	public function getLengthOfService(){
		return $this->teacher->getLengthOfService();
	}
}
$graduateStudent = new GraduateStudent();
echo "name is ".$graduateStudent->getName()."<br>";
echo "lengthOfService is ".$graduateStudent->getLengthOfService();

?>