how to make an auto updater in java code example

Example 1: how to create a hotkey in python

import keyboard
import time
# Using time.sleep, we can dramatically decrease the amount of CPU our program
# uses.

hotkey = "shift + ctrl + F2"
# Remember that the order in which the hotkey is set up is the order you
# need to press the keys.

while True:
  if keyboard.is_pressed(hotkey):
    print("Hotkey is being pressed")
    time.sleep(0.05)
  time.sleep(0.01)

Example 2: auto update time in html

timer();

function timer(){
 var currentTime = new Date()
var hours = currentTime.getHours()
var minutes = currentTime.getMinutes()
var sec = currentTime.getSeconds()
if (minutes < 10){
    minutes = "0" + minutes
}
if (sec < 10){
    sec = "0" + sec
}
var t_str = hours + ":" + minutes + ":" + sec + " ";
if(hours > 11){
    t_str += "PM";
} else {
   t_str += "AM";
}
 document.getElementById('time_span').innerHTML = t_str;
 setTimeout(timer,1000);
}