filename extension

题目描述

Please create a function to extract the filename extension from the given path,return the extracted filename extension or null if none.

输入描述:

输入数据为一个文件路径

输出描述:

对于每个测试实例，要求输出对应的filename extension

示例1

输入

Abc/file.txt

输出

txt

 import java.util.Scanner;
 /**
  *
  * Please create a function to extract the filename extension from the given path, return the extracted filename extension or null if none.
  *     1、用"/" 分割取最后一项
  *  2、用"." 分割取最后一项
  */
 public class Main {
     public static void main(String[] args) {
         Scanner sc = new Scanner(System.in);
         String s = sc.nextLine();
         String[] ss = s.split("/");
          s = ss[ss.length-1];
         String[]s1=s.split("\\."); // .是转义字符 不能直接编写
         if (s1.length>1) {
             s = s1[s1.length-1];
         }else {
             s=null;
         }
         System.out.println(s);
     }
 }