code: public static boolean isAllBlank(final CharSequence... css) {
          if (ArrayUtils.isEmpty(css)) {
              return true;
          }
          for (final CharSequence cs : css) {
              if (isNotBlank(cs)) {
                 return false;
              }
          }
          return true;
      }
docs: <p>Checks if all of the CharSequences are empty (""), null or whitespace only.</p>
  
  <p>Whitespace is defined by {@link Character#isWhitespace(char)}.</p>
  
  <pre>
  StringUtils.isAllBlank(null)             = true
  StringUtils.isAllBlank(null, "foo")      = false
  StringUtils.isAllBlank(null, null)       = true
  StringUtils.isAllBlank("", "bar")        = false
  StringUtils.isAllBlank("bob", "")        = false
  StringUtils.isAllBlank("  bob  ", null)  = false
  StringUtils.isAllBlank(" ", "bar")       = false
  StringUtils.isAllBlank("foo", "bar")     = false
  StringUtils.isAllBlank(new String[] {})  = true
  </pre>
  
  @param css  the CharSequences to check, may be null or empty
  @return {@code true} if all of the CharSequences are empty or null or whitespace only
  @since 3.6