How to pause code without sleep() in JAVA?

Question

Java

The fact is that I am doing such a task and it is forbidden to use the sleep method from Threading.

Create an Enum that represents the colors of the traffic lights. Write a program so that the traffic light does not stop for 3 minutes. The message says "Stop" for 4 seconds when the red light is on, "Wait" for 3 seconds when the yellow light is on, and "Let's go" for 5 seconds when the green light is on.
Note. The sleep() method of the Thread class cannot be used.

Answer 1

The context is unknown, so it is not entirely clear what the one who gave the task expects from you. Maybe it's worth using ScheduledExecutorService.

Answer 2

Perhaps it was meant to use event programming and implement this

state machines

Instead of Sleep use ScheduledThreadPoolExecutor.

Answer 3

pseudo code

start_sleep_time = microtime(now)
while start_sleep_time < microtime(now){}

Answer 4

you can't
write your own sleep():

sleep(int millis) {
  старт = текущее время системы в миллисекундах
  пока (текущее время < старт + millis) 
    ;
}

use our function where necessary