Vfrdtyky

I have 2 threads and a main class in my program and whenever I try and run it, The one thread is giving me an IllegalThreadStateException and I'm not sure why. The program needs to make a tortoise and hare race, the tortoise can move 10 meters and never stop until he reaches 300 meters, and the hare can move 100 meters, but needs to rest 90% of the time. Following is my code, if anyone could help me out I would appreciate it. Additionally, when I did get it to run, the Hare thread is just outputting Hare: 0 a million times, so I'm not sure why that is happening either.

Main Class:

package runnerthread;



public class RunnerThread extends Thread{



    public static void main(String args) {

       System.out.println("Get set...Go!");

        int hPosition = Hare.position;

        int tPosition = Tortoise.position;

        Thread hare = new Thread(new Hare());

        Thread tortoise = new Thread(new Tortoise());

        try{

       while(hPosition<300 && tPosition<300){

           tortoise.start();

           hare.start();

           Thread.sleep(300);

       }

        }catch(InterruptedException e){}

}

}

Tortoise thread:

public class Tortoise extends Thread {

    static int position;

    static int speed = 10;

    @Override

    public void run(){

            position = speed + 10;

        System.out.println("Tortoise: "+position);

    }

}

Hare thread:

import java.util.Random;





public class Hare extends Thread{

     static int position;

    int speed = 100;

    int restingPercent = 90;

    Random random = new Random();

        int randomNum = random.nextInt((100-1)+1) + 1;

    @Override

    public void run(){

    while(position<300){

    if (randomNum<=restingPercent){

        System.out.println("Hare: "+position);

    }else {

        position+=100;

        System.out.println("Hare: "+position);

    }

}

}

}

You cannot call start more than once on a thread. Thread Objects cannot be reused. You can use a Runnable for that purpose. For more info check this answer: https://stackoverflow.com/a/2324114/10632970