an enums question

[Aakash Goel]

This is from ExamLab - paper3

public class EnuClass{
          enum MEnum{A,B,C};
          public static void main(String args[]){
               MEnum me=MEnum.A;
               int A=99;     //1
               int B=98;
               int C=97;
               switch(me){
                    default: System.out.print("Default ");
                    case A: System.out.print("Only A ");
                    case B: System.out.print("Only B ");
                    case C: System.out.println("Only C ");
               }
          }
     }

The output is Only A Only B Only C.

How does A [line 1] match the A inside enum? They are completely different!!!

I thought the default case would match.

This [Only A Only B Only C] is the answer I expect if the cases are defined like :

default: System.out.print("Default ");
case MEnum.A: System.out.print("Only A ");
case MEnum.B: System.out.print("Only B ");
case MEnum.C: System.out.println("Only C ");

[pete stein]

Per the JLS (14:11): The case labels must be constant expressions, int A is a variable while the enum A is a constant. Also the case label constants must be assignable to the switch expression.