주어진 문자열이 다수의 문자열 집합에 속하는지 검증하는 유틸성 클래스

public class DataUtil {

       public static boolean existInSet(String source, Object... elements) {

                boolean bExits = false;

 

               for (Object objElement : elements) {

                     if (source != null && source.equals(objElement)) {

                           bExits = true;   

                           break; 

                     }

               }

              return bExits;

       }

      

      public static String valueOf(Object obj) {

              return (obj == null) ? "" : obj.toString().trim();

 

      }

}