Can someone please help here ?

Question about the task

Countdown at the races

Java Core, Level 6, Lesson 10

Under discussion

help

1. Figure out what the program does.
2. Implement the run method so that each second
the count is displayed, separated by spaces and starting from numSeconds down to 1, and then "Go!" (see the examples).
3. If the thread runs for 3.5 seconds or more, interrupt it using the interrupt method and within the thread display "Interrupted!"

Example for numSeconds = 4 :
"4 3 2 1 Interrupted!"

4. If the thread runs less than 3.5 seconds, it should terminate itself.
Example for numSeconds = 3 :
"3 2 1 Go!"

PS: The sleep method throws an InterruptedException.

Requirements:

The RacingClock class's run method must have a loop.
The RacingClock object must decrease the numSeconds value by one every second.
The main method should call Thread.sleep(3500).
The main method must call the interrupt method on the Clock object.
If numSeconds is 3, then the program should display "3 2 1 Go!".
If numSeconds is 4, then the program should display "4 3 2 1 Interrupted!".

package com.codegym.task.task16.task1617; /* Countdown at the races */ public class Solution { public static volatile int numSeconds = 3; public static void main(String[] args) throws InterruptedException { RacingClock clock = new RacingClock(); //write your code here Thread.sleep(3500); clock.interrupt(); } public static class RacingClock extends Thread { public RacingClock() { start(); } public void run() { //write your code here boolean temp = false; if(numSeconds>3) temp = true; while(!isInterrupted()) { System.out.print(numSeconds+" "); numSeconds=numSeconds-1; if(numSeconds<1)break; } if(temp == false) System.out.print("Go!"); else System.out.print("Interrupted!"); } } }

Comments (7)

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Hoist

Level 35 , San Diego, United States

5 March 2023, 02:33

Look thru these pieces of code to fix yours.

hanumohan

Level 25 , San Jose, United States

1 May 2020, 23:56

try {
               while (!interrupted()) {
                   Thread.sleep(1000);
                   numSeconds--;
               }
           } catch (Exception e){
               if(numSeconds == 0){
                   System.out.println("3 2 1 Go!");

               }else  if( numSeconds != 0){
                   System.out.println("4 3 2 1 Interrupted!");
               }
           }

Hoist

Level 35 , San Diego, United States

5 March 2023, 02:30

perfecto han -- much help -- THX

Thomas

Level 41 , Bayreuth, Germany

5 March 2023, 12:29

it also is possible to make more use of the volatile numSeconds variable and the catch block

try {
    while (numSeconds > 0) {
        System.out.println(numSeconds-- + " ");
        Thread.sleep(1000);
    }
    System.out.println("Go!");
} catch (InterruptedException e) {
    System.out.println("Interrupted!");
}

Anthony Chalk

Level 30 , London, United Kingdom

20 December 2019, 10:22

You need to add

Thread.sleep(1000);

to your loop You'll have to surround that with a try-catch block. If it catches an InterruptedException (which, if numSeconds is greater than 3, it will), then display Interrupted! Edit: I literally just did this task myself and had no idea where to start; your code gave me the right direction. Thanks

Nitin Pawar

Level 27 , Mumbai, India

21 December 2019, 18:16

That did the job Thanks

Hoist

Level 35 , San Diego, United States

5 March 2023, 02:32

Yes. Thanks for that piece od code too.