Future.delayed(Duration(milliseconds: 100), () {
// Do something
});
Timer(Duration(seconds: 5), () {
print(" This line is execute after 5 seconds");
});
Timer(Duration(seconds: 3), () {
print("Yeah, this line is printed after 3 second");
});
// repeatedly :
Timer.periodic(Duration(seconds: 5), (timer) {
print(DateTime.now());
});