java编程 求a+aa+aaa+aaaa+....a(n个)的和，其中a为1-9之间的整数

/*
java编程 求a+aa+aaa+aaaa+....a(n个)的和，其中a为1-9之间的整数
*/

import java.util.*;

public class TestSum {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入基数（0——9）！");
int num = sc.nextInt();
System.out.println("请输入位数！");
int n = sc.nextInt();
int sum = 0;
int result = 0;
int temp = num;
if(num<0||num>9||n<=0) {
System.out.println("输入错误！");
}else {
for(int i=1;i<n;i++) {
temp = temp*10 + num;
sum = sum + temp;
}
result = sum + num;
System.out.println(result);
}
}
}

import java.util.*;

public class Main {

public static void main(String[] args) {
int a, n, sum = 0;
Scanner sc = new Scanner(System.in);
System.out.println("请输入1——9之间的一个数字：");
a = sc.next