implementation of dining philosopher in java

package com.company;import java.util.concurrent.Semaphore;import java.util.concurrent.ThreadLocalRandom;public class Main {    static int philosopher = 5;    static philosopher philosophers[] = new philosopher[philosopher];    static chopstick chopsticks[] = new chopstick[philosopher];    static class chopstick {        public Semaphore mutex = new Semaphore(1);        void grab() {            try {                mutex.acquire();            }            catch (Exception e) {                e.printStackTrace(System.out);            }        }        void release() {            mutex.release();        }        boolean isFree() {            return mutex.availablePermits() > 0;        }    }    static class philosopher extends Thread {        public int number;        public chopstick leftchopstick;        public chopstick rightchopstick;        philosopher(int num, chopstick left, chopstick right) {            number = num;            leftchopstick = left;            rightchopstick = right;        }        public void run(){            while (true) {                leftchopstick.grab();                System.out.println("philosopher " + (number+1) + " grabs left chopstick.");                rightchopstick.grab();                System.out.println("philosopher " + (number+1) + " grabs right chopstick.");                eat();                leftchopstick.release();                System.out.println("philosopher " + (number+1) + " releases left chopstick.");                rightchopstick.release();                System.out.println("philosopher " + (number+1) + " releases right chopstick.");            }        }        void eat() {            try {                int sleepTime = ThreadLocalRandom.current().nextInt(0, 1000);                System.out.println("philosopher " + (number+1) + " eats for " + sleepTime);                Thread.sleep(sleepTime);            }            catch (Exception e) {                e.printStackTrace(System.out);            }        }    }    public static void main(String argv[]) {        for (int i = 0; i < philosopher; i++) {            chopsticks[i] = new chopstick();        }        for (int i = 0; i < philosopher; i++) {            philosophers[i] = new philosopher(i, chopsticks[i], chopsticks[(i + 1) % philosopher]);            philosophers[i].start();        }        while (true) {            try {                // sleep 1 sec                Thread.sleep(1000);                // check for deadlock                boolean deadlock = true;                for (chopstick f : chopsticks) {                    if (f.isFree()) {                        deadlock = false;                        break;                    }                }                if (deadlock) {                    Thread.sleep(1000);                    System.out.println("Everyone Eats");                    break;                }            }            catch (Exception e) {                e.printStackTrace(System.out);            }        }        System.out.println("Exit The Program!");        System.exit(0);    }}