题解 | #包含数字9的数#

public class Main {
    public static void main(String[] args) {
        int count = 0;
        for (int i = 1; i < 2020; i++) {
            String num = String.valueOf(i);
            boolean contains = num.contains("9");
            if (contains){
                count++;
            }
        }
        System.out.println(count);
    }
}