synchronized方式實現生產者-消費者模式

生產者：

public class Producer {
    private String lock;

    public Producer(String lock){
        super();
        this.lock = lock;
    }

    public void setValue(){
        try{
            synchronized (lock){
                if(!ValueObject.value.equals("")){
                    lock.wait();
                }
                String value = System.currentTimeMillis() + "_" + System.nanoTime();
                ValueObject.value = value;
                System.out.println("set:" + value);
                lock.notify();
            }
        }catch (InterruptedException e){
            e.printStackTrace();
        }
    }
}

消費者：

public class Consumer {

    private String lock;

    public Consumer(String lock){
        super();
        this.lock = lock;
    }

    public void getValue(){
        try{
            synchronized (lock){
                if(ValueObject.value.equals("")){
                    lock.wait();
                }
                System.out.println("get:" + ValueObject.value);
                ValueObject.value = "";
                lock.notify();
            }
        }catch (InterruptedException e){
            e.printStackTrace();
        }
    }
}

生產者線程：

public class ThreadProducer extends Thread {
    private Producer producer;

    public ThreadProducer(Producer producer){
        this.producer = producer;
    }

    @Override
    public void run() {
        while (true){
            producer.setValue();
        }
    }
}

消費者線程：

public class ThreadConsumer extends Thread {

    private Consumer consumer;

    public ThreadConsumer(Consumer consumer){
        this.consumer = consumer;
    }

    @Override
    public void run() {
        while (true){
            consumer.getValue();
        }
    }
}

公共值對象

public class ValueObject {
    public static String value = "";
}

啓動類：

public class Run {
    public static void main(String[] args) {
        String lock = new String("");
        Producer p = new Producer(lock);
        Consumer c = new Consumer(lock);
        ThreadProducer pThread = new ThreadProducer(p);
        ThreadConsumer cThread = new ThreadConsumer(c);

        pThread.start();
        cThread.start();
    }
}

運行結果

set:1487991128665_697508406469322
get:1487991128665_697508406469322
set:1487991128665_697508406488082
get:1487991128665_697508406488082
set:1487991128665_697508406506548
get:1487991128665_697508406506548
set:1487991128665_697508406525014
get:1487991128665_697508406525014
set:1487991128665_697508406544066
get:1487991128665_697508406544066