题解 | #在字符串中找出连续最长的数字串#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) {
            String inputStr = in.nextLine();
            inputStr += "A";
            int maxLen = 1;
            int left = 0;
            List<String> results = new ArrayList<>();
            while (left < inputStr.length() - 1) {
                if (!Character.isDigit(inputStr.charAt(left))) {
                    left++;
                    continue;
                }
                for (int right = left + 1; right < inputStr.length(); right++) {
                    if (!Character.isDigit(inputStr.charAt(right))) {
                        if (right - left > maxLen) {
                            maxLen = right - left;
                            results.clear();
                            results.add(inputStr.substring(left, right));
                        } else  if (right  - left == maxLen) {
                            results.add(inputStr.substring(left, right));
                        }
                        left = right + 1;
                    }
                }
            }
            StringJoiner joiner = new StringJoiner("");
            for (String str : results) {
                joiner.add(str);
            }
            System.out.println(joiner.toString() + "," + maxLen);
        }
    }}