Write a java program that runs a random horse race. The specification: There are

Question

Write a java program that runs a random horse race. The specification: There are three horses. During each round, a random number from 1 to 100 is generated for each horse. The horse advances one square if the random number is greater than 50 Show the track like this:

1: -------- H ------|

2: ------- H -------|

3: --------- H ----- |

Write a method showHorse() that takes a horse number (1, 2 or 3), and shows the current position of the horse. Have the program run until one of the horses reaches the finish line - determine the winner. Must use threads for full credit. Output should be user friendly.

Explanation / Answer

public class HorseRace {
   public static void main( String args[] )
   {
      Horse[] horse = new Horse[4];
      for (int i=0; i<horse.length; i++) {
         horse[i] = new Horse(i+1);
      }
      System.err.println( " Starting race" );
      Horse.resetRace();
      for (int i=0; i<horse.length; i++) horse[i].start();
      Reporter rpt = new Reporter(horse);
      rpt.start();
   }
}

class Reporter extends Thread {
   Horse[] horse;
   public Reporter(Horse[] h) {
      System.out.println("And they're off...");
      horse = h;
   }

   public void run() {
      System.out.print("Horse     ");
      for (int i=0; i<horse.length; i++) {
         System.out.printf("%6d ", (i+1));
      }
      System.out.println();
      while (!Horse.done()) {
         System.out.print(" ");
         System.out.print("Distance ");
         for (int i=0; i<horse.length; i++) {
            System.out.printf("%6d ", horse[i].getDistance());
         }
      }
      System.out.print(" ");
      System.out.print("Distance ");
      for (int i=0; i<horse.length; i++) {
         System.out.printf("%6d ", horse[i].getDistance());
      }
      System.out.println(" And the winner is "
         + Horse.getWinner());
   }
}

class Horse extends Thread {
   private static boolean raceOver = false;
   private static final int raceLength = 100;
   private static String winner = "";
   private int distance;
   private String name = "";

   public Horse(int id) {
      name = "Horsie #" + id;
      distance = 0;
   }

   public static void resetRace() { raceOver = false; }
   public static boolean done() { return raceOver; }
   public static String getWinner() { return winner; }
   public int getDistance() { return distance; }

   public void run() {
      while (!raceOver) {
         try {
            // get a little rest and then move
            Thread.sleep((int)(Math.random() * 500));
            if (++distance >= raceLength) raceOver = true;
         } catch (InterruptedException e) {
            System.err.println(e);
         }
      }
      if (distance == raceLength) winner = name;
   }
}

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