使用字符串切割

import java.util.*;
public class Main{
    public static void main(String [] args){
        getNewString();
    }
    public static void getNewString(){
        Scanner scan = new Scanner(System.in);
        while(scan.hasNext()){
            String input = scan.nextLine();
            while(input.length()%8 != 0){
                input += "0";
            }
            while(input.length() > 0){
                System.out.println(input.substring(0,8));
                input = input.substring(8);
            }
        }
    }
}