字節跳動面試編程“www.toutiao.com/p/index.html”轉化爲“html.index/p/com.toutiao.www”

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

//“www.toutiao.com/p/index.html”轉化爲“html.index/p/com.toutiao.www”

public class dizhibianhuan {
    public static void main(String[] args)throws Exception{
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String regEx="[a-zA-Z]"; //
        Pattern p=Pattern.compile(regEx);
        String str=br.readLine();
        String[] str2=str.split("\\.|/");//存放字符串
        Matcher m=p.matcher(str);
        str=m.replaceAll("");
        char[] fuhao=str.toCharArray();//存放符號
        int len=fuhao.length;
        char temp;
        for(int i=0;i<len/2;i++){
            temp=fuhao[len-1-i];
            fuhao[len-1-i]=fuhao[i];
            fuhao[i]=temp;
        }

        int len2=str2.length;
        String temp2=null;
        for(int i=0;i<len2/2;i++){
            temp2=str2[len2-1-i];
            str2[len2-1-i]=str2[i];
            str2[i]=temp2;
        }

        for(int i=0,j=0;i<len2||j<len;i++,j++) {
            System.out.print(str2[i]);
            if(j==len) continue;
            System.out.print(fuhao[j]);
        }
        br.close();
    }
}