给出一个字符串或其他，返回一个指定长度的字符串，长度小于指定长度，用指定字符填充
实现代码如下：
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public static String createNewStr(Object obj,int max_length,boolean insertFrontflag,String insertStr) {return createFactory(max_length,insertFrontflag,String.valueOf(obj).length(),insertStr,String.valueOf(obj));}public static String createFactory(int max_length,boolean insertFrontflag,int current_length, String insertStr, String current_str) {if(current_str.length()>=max_length){return current_str;}if (current_str.length() < max_length) {if(insertFrontflag){ current_str=insertStr+current_str;}else{current_str+=insertStr;}current_str=createFactory(max_length,insertFrontflag,current_str.length(), insertStr, current_str);} else if (current_str.length() == max_length) {return current_str;}return current_str;}public static void main(String[] args) {System.out.println(createNewStr("ffff",100,false,"#"));}?另外String.Format也可实现，详细我的收藏Java里相关