生产者消费者模式到底哪出错了

自己写生产者消费者模式，共享lock锁，但是并没起作用

package com.kaber.thread;

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

/**
 * @author ：Kaber
 * @date ：2022/7/21 0:34
 */
public class DeadThread {
    private static final String lock = "lock";
    public static void main(String[] args) {
        Integer i = 0;

        maker maker = new maker(i, lock);
        spender spender = new spender(i, lock);
        Thread m = new Thread(maker);
        Thread s = new Thread(spender);

        m.setName("生产者");
        s.setName("消费者");
        m.start();
        s.start();


    }


}

class maker implements Runnable {
    private int count;
    private String lock;

    public maker(int count, String lock) {
        this.count = count;
        this.lock = lock;
    }

    @Override
    public void run() {
        while (true) {
            synchronized (lock) {
                while (count == 1) {
                    try {
                        lock.wait();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                count++;
                System.out.println(Thread.currentThread().getName() + "，目前总共有" + count);
                lock.notifyAll();
            }
        }
    }
}
class spender implements Runnable{
    private int count;
    private String lock;
    public spender(int count, String lock) {
        this.count = count;
        this.lock = lock;
    }

    @Override
    public void run() {
        while (true) {
            synchronized (lock) {
                while (count == 0) {
                    try {
                        lock.wait();
                    } catch (Exception e) {
                    }
                }
                count--;
                System.out.println(Thread.currentThread().getName() + "，目前总共有" + count);
                lock.notifyAll();
            }
        }
    }
}
@