题解 | #字符串分隔#

1. 取模： %

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);
        String a = in.nextLine();

        List<String> list = new ArrayList<>();
        int FIXED_LEN = 8;
        int len = a.length();
        StringBuffer sb = new StringBuffer(a);

        if (len % FIXED_LEN != 0) {
            int lackZeros = FIXED_LEN - (len % FIXED_LEN);
            for (int i = 0; i < lackZeros; i++) {
                sb.append(0);
            }
        }

        String afterAddZeros = sb.toString();
        int afterAddZerosLen = afterAddZeros.length();
        for (int i = 0; i < afterAddZerosLen / FIXED_LEN; i++) {
            String str = afterAddZeros.substring(FIXED_LEN * i, FIXED_LEN * (i + 1));
            list.add(str);
        }

        for (String s : list) {
            System.out.println(s);
        }
    }
}