Crazy Java Note-enum class

1 //To implement an enumeration class manually2 //Steps31. Hide the constructor with private42. Use public for all possible instances of this classStaticFinal-Modified class variable to hold53if necessary, you can provide some static methods that allow other programs to obtain matching instances based on specific parameters6  Public classseason{7     //define the season class as immutable and define its field as final8     Private FinalString name;9     Private FinalString desc;Ten      Public Static FinalSeason SPRING One=NewSeason ("Spring", "Find Spring"); A      Public Static FinalSeason SUMMER -=NewSeason ("Summer", "scorching"); -      Public Static FinalSeason FALL the=NewSeason ("Autumn", "Air cool"); -      Public Static FinalSeason WINTER -=NewSeason ("Winter", "Snow viewing"); -      Public StaticSeason Getseason (intSeasomnim) { +         Switch(seasonnum) { -              Case: 1 +                 returnSPRING; A                  Break; at              Case: 2 -                 returnSUMMER; -                  Break; -Caes:3 -                 returnFALL; -                  Break; in              Case: 4 -                 returnWINTER; to                  Break; +             default: -                 return NULL; the         } *     } $     //define the constructor as private access rightsPanax Notoginseng     PrivateSeason (String name,string desc) { -          This. name=name; the          This. desc=desc; +     } A     //getter methods are provided only for name and Desc the      PublicString GetName () { +         return  This. Name; -     } $      PublicString GetDesc () { $         return  This. Desc; -     } - } the  - //test MethodWuyi  Public classseasontest{ the      PublicSeasontest (Season s) { -System.out.println (s.getname+ Wu S.getdesc ()); -     } About      Public Static voidMain (string[] args) { $         //fall constants that use season directly represent a season object -         Newseasontest (season.fall); -     } - } A //use simple static constants to represent +  Public Static Final intSeason_spring=1; the  Public Static Final intseason_summer=2; -  Public Static Final intSeason_fall=3; $  Public Static Final intSeason_winter=4; the  the Enumerate class instances: the  Public enumseasonenum{ the     //4 enumerated instances in the first row - Spring,summer,fall,winter; in } the  the //Test Class About  Public classenumtest{ the      Public voidjudge (Seasonenum s) { the         //the expression in the switch statement can be an enumeration class the         Switch(s) { +              CaseSPRING: -System.out.println ("Spring"); the                  Break;Bayi              CaseSUMMER: theSystem.out.println ("Summer"); the                  Break; -              CaseFALL: -System.out.println ("Fall"); the                  Break; the              CaseWINTER: theSystem.out.println ("Winter"); the                  Break; -             default: theSYSTEM.OUT.PRINTLN ("Error"); the         } the     } 94      Public Static voidMain (string[] args) { the         //all enum classes have the values method, returning all instances of the enumeration class the          for(Seasonenum s:seasonenum.values ()) { the System.out.println (s);98         } About         //usually when enumerating instances are used, they are always accessed by enumclass.variable. -         Newenumtest (). Judge (seasonenum.spring);101     }102}

Crazy Java Note-enum class