public static Class<?> findCommonElementType(Collection collection){
  if (isEmpty(collection)) {
    return null;
  }
  Class<?> candidate=null;
  for (  Object val : collection) {
    if (val != null) {
      if (candidate == null) {
        candidate=val.getClass();
      }
 else       if (candidate != val.getClass()) {
        return null;
      }
    }
  }
  return candidate;
}

public static Class < ? > findCommonElementType ( Collection collection ) { if ( isEmpty ( collection ) ) { return null ; } Class < ? > candidate = null ; for ( Object val : collection ) { if ( val != null ) { if ( candidate == null ) { candidate = val . getClass ( ) ; } else if ( candidate != val . getClass ( ) ) { return null ; } } } return candidate ; }
find the common element type of the given collection , if any .
