code: public static boolean isOnlyUpperCase(String string) {
          boolean result = isNotEmpty(string);
          int idx = 0;
          int len = string.length();
          while (result) {
              if (idx >= len) {
                  break;
              }
              result = isUpperCase(string.charAt(idx));
              idx++;
          }
          return result;
      }
docs: 检测字符串是否全部是大写字母
  
  @param string 字符串
  
  @return {@link Boolean}
  
  @since 1.0.9