Thread slow down by interspersing it with calls to the Thread.sleep(ms) method. ms is the number of milliseconds you want the thread to wait before proceeding on. There are one thousand milliseconds in a second.
The sleep() method throws InterruptedExceptions. Therefore when you put a thread to sleep, you need to catch InterruptedExceptions. Thus every call to sleep() should be wrapped in a try catch block like this:
try {
Thread.sleep(1000);
}
catch (InterruptedException e) {
}
try {
Thread.sleep(1000);
}
catch (InterruptedException e) {
}