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);
    }
}