php抽象类的例子学习php抽象类的实现方法

3. //定义一个抽象类

4. abstract class Staff
5. {
6. abstract function hire();
7. abstract function fire();
8. abstract function promote();
9. abstract function demote();
10. }

11. ?>

例2，php抽象类的例子

3. class Employee {

4. private $title;
5. private $lastName;
6. private $firstName;
7. protected $salary;
8. private $ratio = 0;
10. public function __construct($title, $firstName, $mainName, $salary ) {
11. $this->title = $title;
12. $this->firstName = $firstName;
13. $this->lastName = $mainName;
14. $this->salary = $salary;
15. }

16. public function firstName() {

17. return $this->firstName;
18. }

19. public function getlastName() {

20. return $this->lastName;
21. }

22. public function setRatio( $num ) {

23. $this->ratio=$num;
24. }

25. public function getRatio() {

26. return $this->ratio;
27. }
29. public function getTitle() {
30. return $this->title;
31. }

32. public function getSalary() {

33. return ($this->salary - $this->ratio);
34. }

35. public function getFullName() {

36. return "{$this->firstName}" . " {$this->lastName}";
37. }

38. function getSummaryLine() {

39. $base = "$this->title ( $this->lastName, ";
40. $base .= "$this->firstName )";
41. return $base;
42. }
43. }

44. //定义抽象类

45. abstract class EmployeeWriter {
46. abstract static function write( Employee $shopProduct );
47. }

48. class TextEmployeeWriter extends EmployeeWriter {

49. static function write( Employee $shopEmployee ) {
50. $str = "{$shopEmployee->getTitle()}: ";
51. $str .= $shopEmployee->getFullName();
52. $str .= " ({$shopEmployee->getSalary()})\n";
53. print $str;
54. }
55. }

56. $developer1 = new Employee("A", "A1", "A2", 5.99 );

57. TextEmployeeWriter::write( $developer1 );
58. ?>