题解 | #在字符串中找出连续最长的数字串#

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    static int len = 0;
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String str = in.next();
            String[] nums = str.split("\\D+");
            Arrays.stream(nums).max(Comparator.comparingInt(String::length)).ifPresent(s -> len = s.length());
            Arrays.stream(nums).filter(s -> s.length() == len).forEach(System.out::print);
            System.out.println("," + len);
        }
    }
}