code: private static int totalLength(CharSequence... strs) {
  		int totalLength = 0;
  		for(int i = 0 ; i < strs.length; i++) {
  			totalLength += (null == strs[i] ? 4 : strs[i].length());
  		}
  		return totalLength;
  	}
docs: 给定字符串数组的总长度<br>
  null字符长度定义为0
  
  @param strs 字符串数组
  @return 总长度
  @since 4.0.1