Java enum 的多种解决。

1. public?class?StatusWithoutEnums?{ ????
2. ????public?static?final?int?STATUS_OPEN?=?0; ??????public?static?final?int?STATUS_STARTED?=?1; ??
3. ????public?static?final?int?STATUS_INPROGRESS?=?2; ??????public?static?final?int?STATUS_ONHOLD?=?3; ??
4. ????public?static?final?int?STATUS_COMPLETED?=?4; ??????public?static?final?int?STATUS_CLOSED?=?5; ??
5. ??}??

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1. public?class?RequestStatus?{ ????
2. ????private?final?int?status; ????
3. ????private?RequestStatus(int?aStatus){ ??????????this.status?=?aStatus; ??
4. ????} ????
5. ????public?static?final?RequestStatus?STATUS_OPEN?=?new?RequestStatus(0); ??????public?static?final?RequestStatus?STATUS_STARTED?=?new?RequestStatus(1); ??
6. ????public?static?final?RequestStatus?STATUS_INPROGRESS?=?new?RequestStatus(2); ??????public?static?final?RequestStatus?STATUS_ONHOLD?=?new?RequestStatus(3); ??
7. ????public?static?final?RequestStatus?STATUS_COMPLETED?=?new?RequestStatus(4); ??????public?static?final?RequestStatus?STATUS_CLOSED?=?new?RequestStatus(5); ??
8. ??}??

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1. public?class?ReqStatus?{ ????
2. ????public?enum?Status{ ??????????STATUS_OPEN, ??
3. ????????STATUS_STARTED, ??????????STATUS_INPROGRESS, ??
4. ????????STATUS_ONHOLD, ??????????STATUS_COMPLETED, ??
5. ????????STATUS_CLOSED; ??????} ??
6. ??????public?static?void?main(String[]?args){ ??
7. ????????for?(Status?stat:?Status.values()){ ??????????????System.out.println(stat); ??
8. ????????} ??????} ??
9. }??

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1. public?class?StatusExample1?{ ????
2. ????public?enum?Status{ ??????????STATUS_OPEN(0), ??
3. ????????STATUS_STARTED(1), ??????????STATUS_INPROGRESS(2), ??
4. ????????STATUS_ONHOLD(3), ??????????STATUS_COMPLETED(4), ??
5. ????????STATUS_CLOSED(5); ????
6. ????????private?final?int?status; ????
7. ????????Status(int?aStatus){ ??????????????this.status?=?aStatus; ??
8. ????????} ??????????public?int?status(){ ??
9. ????????????return?this.status; ??????????} ??
10. ????}??? ????
11. ????public?static?void?main(String[]?args){ ??????????for?(Status?stat:?Status.values()){ ??
12. ????????????System.out.println(stat?+?"value?is?"+?new?Integer(stat.status())); ??????????} ??
13. ????} ??}??

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1. public?class?StatusExample2?{ ????
2. ????public?enum?Status{ ??????????STATUS_OPEN(0,?"open"), ??
3. ????????STATUS_STARTED(1,?"started"), ??????????STATUS_INPROGRESS(2,?"inprogress"), ??
4. ????????STATUS_ONHOLD(3,?"onhold"), ??????????STATUS_COMPLETED(4,?"completed"), ??
5. ????????STATUS_CLOSED(5,?"closed"); ????
6. ????????private?final?int?status; ??????????private?final?String?description; ??
7. ??????????Status(int?aStatus,?String?desc){ ??
8. ????????????this.status?=?aStatus; ??????????????this.description?=?desc; ??
9. ????????} ??????????public?int?status(){ ??
10. ????????????return?this.status; ??????????} ??
11. ????????public?String?description(){ ??????????????return?this.description; ??
12. ????????} ??????}??? ??
13. ??????public?static?void?main(String[]?args){ ??
14. ????????for?(Status?stat:?Status.values()){ ??????????????System.out.println(stat?+?"value?is?"+?new?Integer(stat.status())?+?"?desc?is?"?+?stat.description()); ??
15. ????????} ??????} ??
16. }??

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1. import?java.io.Serializable; ????
2. public?class?StatusExample3?{ ????
3. ????public?enum?Status?implements?Serializable{ ??????????STATUS_OPEN(0,?"open"), ??
4. ????????STATUS_STARTED(1,?"started"), ??????????STATUS_INPROGRESS(2,?"inprogress"), ??
5. ????????STATUS_ONHOLD(3,?"onhold"), ??????????STATUS_COMPLETED(4,?"completed"), ??
6. ????????STATUS_CLOSED(5,?"closed"); ????
7. ????????private?final?int?status; ??????????private?final?String?description; ??
8. ??????????Status(int?aStatus,?String?desc){ ??
9. ????????????this.status?=?aStatus; ??????????????this.description?=?desc; ??
10. ????????} ??????????public?int?status(){ ??
11. ????????????return?this.status; ??????????} ??
12. ????????public?String?description(){ ??????????????return?this.description; ??
13. ????????} ????
14. ????} ??}??

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1. public?class?StatusExample4?{ ????
2. ????public?enum?Status{ ??????????STATUS_OPEN(0,?"open"), ??
3. ????????STATUS_STARTED(1,?"started"), ??????????STATUS_INPROGRESS(2,?"inprogress"), ??
4. ????????STATUS_ONHOLD(3,?"onhold"), ??????????STATUS_COMPLETED(4,?"completed"), ??
5. ????????STATUS_CLOSED(5,?"closed"); ????
6. ????????private?final?int?status; ??????????private?final?String?description; ??
7. ??????????Status(int?aStatus,?String?desc){ ??
8. ????????????this.status?=?aStatus; ??????????????this.description?=?desc; ??
9. ????????} ??????????public?int?status(){ ??
10. ????????????return?this.status; ??????????} ??
11. ????????public?String?description(){ ??????????????return?this.description; ??
12. ????????} ????
13. ????????public<STATUS>?int?compareTo(Status?obj){ ??????????????return?0; ??
14. ????????} ??????} ??
15. }??

1. public?class?StatusExample5?{ ????
2. ????public?enum?Status{ ??????????STATUS_OPEN ??
3. ????????{ ??????????????public?String?description(){ ??
4. ????????????????return?"open"; ??????????????} ??
5. ????????}, ??????????STATUS_STARTED ??
6. ????????{ ??????????????public?String?description(){ ??
7. ????????????????return?"started"; ??????????????} ??
8. ????????}, ??????????STATUS_INPROGRESS ??
9. ????????{ ??????????????public?String?description(){ ??
10. ????????????????return?"inprogress"; ??????????????} ??
11. ????????}, ??????????STATUS_ONHOLD ??
12. ????????{ ??????????????public?String?description(){ ??
13. ????????????????return?"onhold"; ??????????????} ??
14. ????????}, ??????????STATUS_COMPLETED ??
15. ????????{ ??????????????public?String?description(){ ??
16. ????????????????return?"completed"; ??????????????} ??
17. ????????}, ??????????STATUS_CLOSED ??
18. ????????{ ??????????????public?String?description(){ ??
19. ????????????????return?"closed"; ??????????????} ??
20. ????????}; ????
21. ????????Status(){ ??????????} ??
22. ??????????public?abstract?String?description(); ??
23. ??????} ??
24. ????public?static?void?main(String[]?args){ ??????????for?(Status?stat:?Status.values()){ ??
25. ????????????System.out.println(stat?+?"?desc?is?"?+?stat.description()); ??????????} ??
26. ????} ????
27. }??

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1. public?class?StatusExample6{ ????
2. ????public?enum?Status{ ??????????STATUS_OPEN(0,?"open"), ??
3. ????????STATUS_STARTED(1,?"started"), ??????????STATUS_INPROGRESS(2,?"inprogress"), ??
4. ????????STATUS_ONHOLD(3,?"onhold"), ??????????STATUS_COMPLETED(4,?"completed"), ??
5. ????????STATUS_CLOSED(5,?"closed"); ????
6. ????????private?final?int?status; ??????????private?final?String?description; ??
7. ??????????Status(int?aStatus,?String?desc){ ??
8. ????????????this.status?=?aStatus; ??????????????this.description?=?desc; ??
9. ????????} ??????????public?int?status(){ ??
10. ????????????return?this.status; ??????????} ??
11. ????????public?String?description(){ ??????????????return?this.description; ??
12. ????????} ??????} ??
13. ??????private?static?void?checkStatus(Status?status){ ??
14. ????????switch(status){ ??????????????case?STATUS_OPEN: ??
15. ????????????????System.out.println("This?is?open?status"); ??????????????case?STATUS_STARTED: ??
16. ????????????????System.out.println("This?is?started?status"); ??????????????case?STATUS_INPROGRESS: ??
17. ????????????????System.out.println("This?is?inprogress?status"); ??????????????case?STATUS_ONHOLD: ??
18. ????????????????System.out.println("This?is?onhold?status"); ??????????????case?STATUS_COMPLETED: ??
19. ????????????????System.out.println("This?is?completed?status"); ??????????????case?STATUS_CLOSED: ??
20. ????????????????System.out.println("This?is?closed?status"); ??????????} ??
21. ??????} ??
22. ??????public?static?void?main(String[]?args){ ??
23. ????????checkStatus(Status.STATUS_CLOSED); ??????} ??
24. ??}??