Lock版的生产者与消费者问题_lock unlock解决生产者消费者问题-优快云博客

该博客示例展示了如何使用Java的Lock接口和Condition来解决经典的生产者消费者问题。通过创建一个共享资源类Data2，包含increment()和decrement()方法，实现了在数字不为0时生产者线程等待，数字为0时消费者线程等待的逻辑。每个操作完成后，使用condition.signalAll()唤醒等待的线程，确保线程间的同步。

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Lock版的生产者与消费者问题

package com.king.pc;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class B {
    public static void main(String[] args) {
        Data2 data2 = new Data2();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data2.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"A").start();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data2.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"B").start();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data2.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"C").start();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data2.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"D").start();
    }
}
//判断等待，业务,通知
class Data2{ //数字、资源类

    private int number = 0;

    Lock lock = new ReentrantLock();
    Condition condition = lock.newCondition();

    //+1
    public void increment() throws InterruptedException {
        lock.lock();
        try {
            while (number!=0){
                //等待
                condition.await();
            }
            number++;
            System.out.println(Thread.currentThread().getName()+"=>"+number);
            //通知其他线程，我+1完毕
            condition.signalAll();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    //-1
    public void decrement() throws InterruptedException {
        lock.lock();
        try {
            while (number==0){
                //等待
                condition.await();
            }
            number--;
            System.out.println(Thread.currentThread().getName()+"=>"+number);
            //通知其他线程，我+1完毕
            condition.signalAll();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
}