每日总结

2020年11月15日：

此程序运行时输出来时的“*”号是每个500毫秒进行输出的，这是因为程序在调用start函数时运行时被sleep函数进行了阻拦，进而造成程序被“沉睡”的感觉。

线程的同步：

 生产者和消费者：

package xian;
import java.util.LinkedList;
import java.util.Queue;
public class xiao {
    private final int MAX_LEN = 10;
    private Queue<Integer> queue = new LinkedList<Integer>();
    class Producer extends Thread {
        @Override
        public void run() {
            producer();
        }
        private void producer() {
            while(true) {
                synchronized (queue) {
                    while (queue.size() == MAX_LEN) {
                        queue.notify();
                        System.out.println("当前队列满");
                        try {
                            queue.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    queue.add(1);
                    queue.notify();
                    System.out.println("生产者生产一条任务，当前队列长度为" + queue.size());
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
    class Consumer extends Thread {
        @Override
        public void run() {
            consumer();
        }
        private void consumer() {
            while (true) {
                synchronized (queue) {
                    while (queue.size() == 0) {
                        queue.notify();
                        System.out.println("当前队列为空");
                        try {
                            queue.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    queue.poll();
                    queue.notify();
                    System.out.println("消费者消费一条任务，当前队列长度为" + queue.size());
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
    public static void main(String[] args) {
      xiao pc = new xiao();
        Producer producer = pc.new Producer();
        Consumer consumer = pc.new Consumer();
        producer.start();
        consumer.start();
    }
}