Dining Philosophers Problem (#1944)
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package com.baeldung.concurrent.diningphilosophers;
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public class DiningPhilosophers {
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public static void main(String[] args) throws Exception {
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Philosopher[] philosophers = new Philosopher[5];
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Object[] forks = new Object[philosophers.length];
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for (int i = 0; i < forks.length; i++) {
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forks[i] = new Object();
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}
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for (int i = 0; i < philosophers.length; i++) {
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Object leftFork = forks[i];
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Object rightFork = forks[(i + 1) % forks.length];
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if (i == philosophers.length - 1) {
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philosophers[i] = new Philosopher(rightFork, leftFork); // The last philosopher picks up the right fork first
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} else {
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philosophers[i] = new Philosopher(leftFork, rightFork);
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}
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Thread t = new Thread(philosophers[i], "Philosopher " + (i + 1));
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t.start();
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}
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}
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}
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package com.baeldung.concurrent.diningphilosophers;
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public class Philosopher implements Runnable {
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private final Object leftFork;
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private final Object rightFork;
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public Philosopher(Object left, Object right) {
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this.leftFork = left;
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this.rightFork = right;
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}
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private void doAction(String action) throws InterruptedException {
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System.out.println(Thread.currentThread().getName() + " " + action);
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Thread.sleep(((int) (Math.random() * 100)));
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}
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@Override public void run() {
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try {
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while (true) {
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doAction(System.nanoTime() + ": Thinking"); // thinking
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synchronized (leftFork) {
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doAction(System.nanoTime() + ": Picked up left fork");
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synchronized (rightFork) {
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doAction(System.nanoTime() + ": Picked up right fork - eating"); // eating
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doAction(System.nanoTime() + ": Put down right fork");
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}
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doAction(System.nanoTime() + ": Put down left fork. Returning to thinking");
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}
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}
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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return;
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}
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}
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}
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