java循环输入(挺快的)

解题思路:

注意事项:

参考代码:

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

List<String> list = new ArrayList<>();

while (sc.hasNext()) {

String temp = sc.nextLine();

list.add(temp);

}

for (String str : list) {

System.out.println(everySum(str));

}

}

public static int everySum(String str) {

int sum = 0;

for (int i = 0; i < str.length(); i++) {

int temp = str.charAt(i) - '0';

sum += temp;

}

if (sum >= 10) {

//保证其返回的是最后一个sum

return everySum(Integer.toString(sum));

} else {

return sum;

}

}

}