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

public class Mydemo {
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan=new Scanner(System.in);
        while(true) {
        
        String s=scan.nextLine();
        int location=s.lastIndexOf(".");
        char temp[]=s.toCharArray();
        for(int i=0;i<s.length();i++) {
            if(i>location) {
                System.out.print(temp[i]);
            }
        }
        System.out.println();
        
        }
                
        
        
    }

}