21-define enumerative constructors, methods, and fields

Package demo; import Org. JUnit. test; // defines the enumerated constructors, methods, and fields public class demoenum {@ testpublic void test () {print (grade. b);} public void print (grade G) {string value = G. getvalue (); system. out. println (value);}/*** this class is equivalent to * class grade () {* Private grade () {} * Public static final grade A = new grade (); * Public static final grade B = new grade (); * Public static final grade C = new grade (); * Public static final grade D = new grade (); * Public static final grade E = new grade (); ***} ***/Enum grade {A ("100-90"), B ("89-80 "), C ("79-70"), D ("69-60"), E ("59-0"); Private string value; private grade (string value) {This. value = value;} Public String getvalue () {return this. value ;}}}