字符串中找数字最长 · 学会利用正则

import java.io.*;
import java.util.*;

public class Main{
    public static void main(String[] args) throws Exception{
        Scanner sc = new Scanner(System.in);

        while(sc.hasNextLine()){
            String line = sc.nextLine();
            String[] ss = line.split("[^0-9]+");
            int max  = 0;
            ArrayList<String> list = new ArrayList<>();
            for(String s : ss){
                if(s.length() > max){
                    max = s.length();
                    list.clear();
                    list.add(s);
                }else if(s.length() == max){
                    max = s.length();
                    list.add(s);
                }
            }
            StringBuilder sb = new StringBuilder();
            for(String item : list){
                sb.append(item);
            }
            sb.append(",").append(max);
            System.out.println(sb.toString());
        }
    }
}