实现枚举的类

public class RateStatueEnum {
     private  String statue;
     private RateStatueEnum(String statue){
          this.statue=statue;
     }
     public String toString(){
          return statue;
     }
     public final static RateStatueEnum invalid=new RateStatueEnum("失效");
     public final static RateStatueEnum valid=new RateStatueEnum("有效");

     public static void main(String args[]){
          System.out.println(RateStatueEnum.invalid.toString());
          System.out.println(RateStatueEnum.valid.toString());
     }
}