아날로그 생성 핸드폰 번호

public static void main(String[] args) {
	  for(int j = 0; j <= 99999999; j++) {
		String phone = getHourFreq(j+"");
		if(j % 10000 == 0) {
			System.out.println(186+phone);
		}
	}
}

public static String getHourFreq(String str) {
	byte[] hourArray = new byte[8-str.length()]; 
	return bytesToString(hourArray)+str;
}

private static String bytesToString(byte[] bArray) {
    StringBuffer sb = new StringBuffer();
    for (byte b : bArray)
    {
        sb.append(b);
    }
    return sb.toString();
}