Create a program for a race where 5 people start simultaneously, using multithreading to determine the first finisher.

Question

Accepted Answer

A program to simulate a race with 5 people using multithreading and determine the winner.

Create a class for the race participants
Implement the Runnable interface for each participant
Use a thread pool to manage the threads
Start all threads simultaneously
Wait for all threads to finish
Determine the winner based on the finishing time

Accepted Answer

public class ThreadRace {
    public static void main(String[] args) {
        // Create an array to store threads for participants
        Thread[] participants = new Thread[5];
        Participant[] racers = new Participant[5]; // Array to keep track of Participant objects

// Create and start threads for each participant
        for (int i = 0; i < 5; i++) {
            racers[i] = new Participant("Participant " + (i + 1));
            participants[i] = new Thread(racers[i]);
            participants[i].start();
        }

// Wait for all threads to finish (i.e., reach the finish line)
        for (Thread participant : participants) {
            try {
                participant.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

// Determine the winner
        Participant winner = null;
        for (Participant participant : racers) {
            if (winner == null || participant.getFinishTime() < winner.getFinishTime()) {
                winner = participant;
            }
        }

System.out.println("Winner: " + winner.getName());
    }
}

class Participant implements Runnable {
    private String name;
    private long finishTime;

public Participant(String name) {
        this.name = name;
    }

public String getName() {
        return name;
    }

public long getFinishTime() {
        return finishTime;
    }

@Override
    public void run() {
        System.out.println(name + " has started running.");
        // Simulate participant running
        try {
            Thread.sleep((long) (Math.random() * 5000)); // Random time for running
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        finishTime = System.currentTimeMillis(); // Record finish time
        System.out.println(name + " has finished the race.");
    }
}

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