Java extendable enumeration

public enum ORDERFIELDS
    	{
    		   OrderID("Order_ID");
    		private String FieldName;

    		private ORDERFIELDS(String fname)
    			{
    				this.FieldName = fname;
    			}

    		public String getFieldName()
    			{
    				return FieldName;
    			}
    	}

public abstract class DatabaseField {

  private String FieldName;

  private DatabaseField(String fname) {
    this.FieldName = fname;
  }

  public String getFieldName() {
    return FieldName;
  }
}