1. 编写一个java程序,实现字符串大小写的转换并倒序输出. 要求如下:

package p1;public class J_ReadTxt{ private static String reverse ( String input ) { if (input.isEmpty ()) { return ""; } String end = input.substring (input.length () - 1, input.length ()); char[] cs = end.toCharArray (); if (cs[0] =