Problems with time format in SimpleDateFormat. Where did you mess up?

Question

Java

The application is loaded with a schedule, and there is a method that gives a schedule item depending on the time. For convenience, I did this:

Date date = new Date();
    SimpleDateFormat hour = new SimpleDateFormat("HH");
    String stringHour = hour.format(date);
    int intHour = Integer.parseInt(stringHour);
    SimpleDateFormat minute = new SimpleDateFormat("mm");
    String stringMinute = minute.format(date);
    int intMinute = Integer.parseInt(stringMinute);
    public int hourandminute = (intHour * 100) + intMinute;

Accordingly, I get a variable at the output that turns 07:45 into 745 and so on.
There is also an if , which, depending on the value of hourandminute, gives a specific item. That's only when the time steps over the mark at 13 o'clock - it gives out the item that should have been issued 12 hours ago.
Accordingly, I understand that hour produces in a 12-hour format. Googled a lot, tried to change HH to k, KK and others - the problem is the same. What do I mess with?
Z.Y. Please do not scold too much, I started studying a couple of weeks ago and wanted to practice a little. :)

Answer 1

Then you should have written:

Date date = new Date();
    SimpleDateFormat hoursmins = new SimpleDateFormat("HHmm");
    String stringHoursMins = hoursmins .format(date);
    int hourandminute = Integer.parseInt(hoursmins );

It's not clear why SimpleDateFormat outputs in 12 hour format. Always and everywhere issued in the format 0-23.
It is also not clear why it is required to multiply hours by 100. It turns out some kind of alien time system. So, instead of our 12 hours 30 minutes = 750 minutes, we get 1230 = 20 hours 30 minutes. But these may already be implementation features or historical features of the account in different sectors of the economy (railway sailors ...)