单节点获取订单号之lock锁

效果：

100个线程同时获取订单号

1，创建OrderService类

package com.hyw.service;

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

public class OrderService implements Runnable {
    static Integer number = 50000000;   //初始化定单号
    private Lock lock = new ReentrantLock();

    @Override
    public void run() {
        getNumber();
    }

    private void getNumber(){
        try {
            lock.lock();
            String number = generatorNumber();
            System.out.println(Thread.currentThread()+",获取的number:"+number);
        } finally {
            lock.unlock();
        }
    }

    /**
     * 生成单号
     * @return
     */
    static String generatorNumber(){
        String dh = "单号："+number;
        number ++;

        return dh;
    }
}

2.模拟100个线程生成订单号

package com.hyw.lock;

import com.hyw.service.OrderService;

public class TestMain {
    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            new Thread(new OrderService()).start();
        }
    }
}

运行结果：