java | 哲学家就餐问题

代码如下

package com.redisc;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.locks.ReentrantLock;

@Slf4j(topic = "c.Run")
public class Run {

    private static ReentrantLock reentrantLock = new ReentrantLock();

    public static void main(String[] args) {
        Chopstick c1 = new Chopstick("1");
        Chopstick c2 = new Chopstick("2");
        Chopstick c3 = new Chopstick("3");
        Chopstick c4 = new Chopstick("4");
        Chopstick c5 = new Chopstick("5");
        new Philosopher("苏格拉底", c1, c2).start();
        new Philosopher("柏拉图", c2, c3).start();
        new Philosopher("亚里士多德", c3, c4).start();
        new Philosopher("赫拉克利特", c4, c5).start();
        new Philosopher("阿基米德", c5, c1).start();
    }
}

class Philosopher extends Thread {
    Chopstick left;
    Chopstick right;
    String name;

    public Philosopher(String name, Chopstick c1, Chopstick c2) {
        left = c1;
        right = c2;
        this.name = name;
    }

    public void run() {
        while (true) {
            // 尝试获得左手筷子
            if (left.tryLock()) {
                try {
                    // 尝试获得右手筷子
                    if (right.tryLock()) {
                        try {
                            System.out.println(name + " eating...");
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        } finally {
                            right.unlock();
                        }
                    }
                } finally {
                    left.unlock();
                }
            }
        }
    }
}

class Chopstick extends ReentrantLock {
    String name;

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

    @Override
    public String toString() {
        return "筷子{" + name + '}';
    }
}