打印从1到n位最大的数

public static void printN(int n) {
        if (n <= 0)
            return;
        char[] number = new char[n];
        for (int i = 0; i < n; i++) {
            number[i] = '0';
        }
        while (!increment(number)) {
            printNumbers(number);
        }
    }
	//char数组模拟整型自增
    private static boolean increment(char[] number) {
        boolean isOverFlow = false;
        int flag = 0;//进位标志
        int length = number.length;
        for (int i = length - 1; i >= 0; i--) {
            int cur = number[i] - '0' + flag;
            if (i == length - 1)
                cur++;
            if (cur >= 10) {
                if (i == 0) {
                    isOverFlow = true;
                } else {
                    flag = 1;
                    cur -= 10;
                    number[i] = (char) ('0' + cur);
                }
            } else {
                number[i] = (char) ('0' + cur);
                break;
            }
        }
        return isOverFlow;
    }
	//打印
    private static void printNumbers(char[] number) {
        boolean isBegin = false;
        for (int i = 0; i < number.length; i++) {
            if (number[i] != '0') {
                isBegin = true;
            }
            if(isBegin) {
                System.out.print(number[i]);
            }
        }
        System.out.println();
    }