Java實現的注冊工廠模式

Java實現的注冊工廠模式

1. package com.eric.reflect;
3. import java.util.ArrayList;
4. import java.util.Random;
5. /*
6. * factory interface
7. * */
8. interface Factory<T> {
9. public T create();
10. }
12. public class RegisterFactory {
14. public static void main(String[] args) {
15. System.out.println(Part.randomPart());
16. }
17. }
19. class Part {
20. private static ArrayList<Factory<? extends Part>> factoryList = new ArrayList<Factory<? extends Part>>();
21. /*
22. * registry all factory in factoryList when initialize class
23. * */
24. static {
25. factoryList.add(new AirFilter().new AirFilterFactory());
26. factoryList.add(new CabinFilter().new CabinFilterFactory());
27. factoryList.add(new CabinBelt().new CabinBeltFactory());
28. factoryList.add(new AirBelt().new AirBeltFactory());
29. }
31. public static Part randomPart() {
32. return factoryList.get(new Random().nextInt(factoryList.size()))
33. .create();
34. }
36. @Override
37. public String toString() {
38. return getClass().getSimpleName();
39. }
40. }
42. class Filter extends Part {
43. }
45. class Belt extends Part {
46. }
48. class AirBelt extends Belt {
49. class AirBeltFactory implements Factory<AirBelt> {
50. public AirBelt create() {
51. return new AirBelt();
52. }
53. }
54. }
56. class CabinBelt extends Belt {
57. class CabinBeltFactory implements Factory<CabinBelt> {
58. public CabinBelt create() {
59. return new CabinBelt();
60. }
61. }
62. }
64. class AirFilter extends Filter {
65. class AirFilterFactory implements Factory<AirFilter> {
66. public AirFilter create() {
67. return new AirFilter();
68. }
69. }
70. }
72. class CabinFilter extends Filter {
73. class CabinFilterFactory implements Factory<CabinFilter> {
74. public CabinFilter create() {
75. return new CabinFilter();
76. }
77. }
78. }
80. /*
81. *
82. * History:
83. *
84. *
85. *
86. * $Log: $
87. */