Sleeping Beauty problem: Difference between revisions

import java.util.concurrent.ThreadLocalRandom;

public final class SleepingBeauty {

public static void main(String[] aArgs) {

final int experiments = 1_000_000;

ThreadLocalRandom random = ThreadLocalRandom.current();

enum Coin { HEADS, TAILS }

int heads = 0;

int awakenings = 0;

for ( int i = 0; i < experiments; i++ ) {

Coin coin = Coin.values()[random.nextInt(0, 2)];

switch ( coin ) {

case HEADS -> { awakenings +=1; heads += 1; }

case TAILS -> awakenings += 2;

}

}

System.out.println("Awakenings over " + experiments + " experiments: " + awakenings);

String credence = String.format("%.3f", (double) heads / awakenings);

System.out.println("Sleeping Beauty should estimate a credence of: " + credence);

}

}

Awakenings over 1000000 experiments: 1499522

Sleeping Beauty should estimate a credence of: 0.334