JAVA字符截断保留尾部

import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class Demo {     public static void main(String[] args) {         String s = "wwww.eee.uploadfinal.docx";         //s = s.substring(s.indexOf("."),0);         //ip = ip.substring(ip.lastIndexOf('/'));         s = s.substring(s.lastIndexOf("."));         System.out.println(s);    }}