Java通過wait()和notifyAll()方法實現執行緒間的通訊

Java程式碼（使用了2個內部類）：

package Threads;

import java.util.LinkedList;

/**
 * Created by Frank
 */
public class ProdCons {
    protected LinkedList<Object> list = new LinkedList<>();
    protected int max;
    protected boolean done = false;

    public static void main(String[] args) throws InterruptedException {
        ProdCons prodCons = new ProdCons(100, 3, 4);
        Thread.sleep(5 * 1000);
        synchronized (prodCons.list) {
            prodCons.done = true;
            try {
                prodCons.notifyAll();
            } catch (Exception ex) {
            }
        }
    }

    private ProdCons(int maxThreads, int nP, int nC) {
        this.max = maxThreads;
        for (int i = 0; i < nP; i++) {
            new Producer().start();
        }
        for (int i = 0; i < nC; i++) {
            new Consumer().start();
        }
    }

    class Producer extends Thread {
        public void run() {
            while (true) {
                Object justProduced = null;
                try {
                    justProduced = getObj();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (list) {
                    while (list.size() == max) {
                        try {
                            list.wait();
                        } catch (InterruptedException e) {
                            System.out.println("Producer INTERRUPTED");
                        }
                    }
                    list.addFirst(justProduced);
                    list.notifyAll();
                    System.out.println("Produced 1;List size now " + list.size());
                    if (done) {
                        break;
                    }
                }
            }
        }
    }

    class Consumer extends Thread {
        public void run() {
            while (true) {
                Object object = null;
                synchronized (list) {
                    if (list.size() == 0) {
                        try {
                            list.wait();
                        } catch (InterruptedException e) {
                            System.out.println("Consumer INTERRUPTED");
                        }
                    }
                    if (list.size() > 0) {
                        object = list.removeLast();
                    }
                    list.notifyAll();
                    System.out.println("List size now " + list.size());
                    if (done) {
                        break;
                    }
                }
                if (null != object) {
                    System.out.println("Consuming object " + object);
                }
            }
        }
    }

    private Object getObj() throws InterruptedException {
        Thread.sleep(1000);
        return new Object();
    }
}