求两数之间关系的关键算法

package seven;

import java.util.Scanner;

public class three {
    public static void main(String[] args) {
        int s=0;
        int s1=0;
        int s2=0;
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要求和的数字:");
        int a=sc.nextInt();
        for (int i = 1; i <= a; i++) {
            s1=s1+show(i-1);//得出例:2,22

            s2=s1+s2;//求出例:2,22等数相加的和
        }
        s=s2*a;//求出最后结果
        System.out.println("s="+s);
    }

    public static int show(int a) {
        if (a == 0) {
            return 1;
        }
        else {
            int aa = 1;
            while (a != 0) {
                aa = aa * 10;
                a--;
            }
            return aa;
        }

    }
}