哲学家就餐问题-526互联

package com.shenzhen.dai;

import lombok.AllArgsConstructor;
import lombok.Data;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Philosopher extends Thread {
    @Data
    @AllArgsConstructor
    static class Chopstick {
        private int id;

    }

    private String name;
    private Chopstick left, right;
    private Random random;

    Philosopher(String name, Chopstick left, Chopstick right) {
        this.name = name;
        this.left = left;
        this.right = right;
        random = new Random();
    }

    private void doAction(String action, Integer seconds) throws InterruptedException {
        System.out.println(
                Thread.currentThread().getName() + " " + action);
        Thread.sleep(((int) (Math.random() * 10 * seconds)));
    }

    @Override
    public void run() {
        try {
            while (true) {
                synchronized (left) {
                    doAction("pick left c", 1);
                    synchronized (right) {
                        doAction("pick right c and eating", 1);
                        doAction("pick down right c", 1);
                    }
                    doAction("pick down left c", 1);
                }
            }
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) throws InterruptedException {
        List<Philosopher> philosopherList = new ArrayList<>();
        List<Object> forks = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            forks.add(new Chopstick(i + 1));
        }
        for (int i = 0; i < forks.size(); i++) {
            Chopstick left = (Chopstick) forks.get(i);
            Chopstick right = (Chopstick) forks.get((i + 1) % forks.size());
            Philosopher philosopher = null;
            if (System.identityHashCode(left) < System.identityHashCode(right)) {
                philosopher = new Philosopher(("name" + i + 1), left, right);
            } else {
                philosopher = new Philosopher(("name" + i + 1), right, left);
            }
            philosopherList.add(philosopher);
        }
        for (Philosopher philosopher : philosopherList) {
            philosopher.start();
            System.out.println("System.identityHashCode(philosopher) = " + System.identityHashCode(philosopher));
        }
    }
}