输入数字 n，按顺序输出从 1 最大的 n 位 10 进制数

import java.math.BigInteger;
import java.util.*;

public class Main {

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scan = new Scanner(System.in);
int  n = scan.nextInt();
fun(n);
}

private static void fun(int n) {
int []a = new int
;
StringBuffer sb = new StringBuffer();
Arrays.fill(a, 9);
for (int i = 0; i < a.length; i++) {
sb.append(a[i]);

}
BigInteger k = new BigInteger(sb.toString());
for (BigInteger i = BigInteger.ZERO; i.compareTo(k) < 0;
i = i.add(BigInteger.ONE)) {
System.out.println(i);
}
}

}