import  java.util.*;

 public   class  ObjectTest {

     public   static  enum ETest {TYPE, ID, PAY_TIME, ACCOUNT, SUM, TIMESTAMP, COMMENT, SIGN;}

     public   static  EnumSet<ETest> validValues;

     public   static   void  main(String[] args) { 
	validValues = EnumSet.of(ETest.ACCOUNT, ETest.SUM, ETest.TIMESTAMP, ETest.TYPE, ETest.SIGN);
        doTest();
    } 

     public   static   void  doTest() {
         for  (ETest eTest : validValues) {
            System.out.println(eTest.name());
        }
    }
}

ACCOUNT
SUM
TIMESTAMP
SIGN

ACCOUNT
SUM
TIMESTAMP
TYPE <-- должен быть здесь 
SIGN

TYPE <-- почему здесь 
ACCOUNT
SUM
TIMESTAMP
SIGN