Java解决同时出库入库订单号自动获取问题解决

import java.util.concurrent.atomic.AtomicLong;  
public class OrderNumberGenerator {  
    private static final AtomicLong orderIdGenerator = new AtomicLong(1); // 假设从1开始  
    // 线程任务，模拟出库或入库  
    static class OrderTask implements Runnable {  
        private final String type; // 出库或入库  
        public OrderTask(String type) {  
            this.type = type;  
        }  
        @Override  
        public void run() {  
            long orderId = orderIdGenerator.incrementAndGet(); // 线程安全地获取下一个订单号  
            System.out.println(Thread.currentThread().getName() + " 执行 " + type + " 操作，订单号：" + orderId);  
        }  
    }  
    public static void main(String[] args) {  
        // 创建并启动多个线程模拟并发操作  
        Thread t1 = new Thread(new OrderTask("出库"), "出库线程1");  
        Thread t2 = new Thread(new OrderTask("入库"), "入库线程1");  
        Thread t3 = new Thread(new OrderTask("出库"), "出库线程2");  
        Thread t4 = new Thread(new OrderTask("入库"), "入库线程2");  
        t1.start();  
        t2.start();  
        t3.start();  
        t4.start();  
        // 等待所有线程完成  
        try {  
            t1.join();  
            t2.join();  
            t3.join();  
            t4.join();  
        } catch (InterruptedException e) {  
            e.printStackTrace();  
        }  
    }  
}

import java.util.concurrent.atomic.AtomicLong;  
// 线程任务类，用于模拟出库或入库操作  
class OrderTask implements Runnable {  
    private final String type; // 出库或入库  
    private final AtomicLong orderIdGenerator; // 订单号生成器  
    public OrderTask(String type, AtomicLong orderIdGenerator) {  
        this.type = type;  
        this.orderIdGenerator = orderIdGenerator;  
    }  
    @Override  
    public void run() {  
        // 线程安全地获取下一个订单号  
        long orderId = orderIdGenerator.incrementAndGet();  
        // 模拟出库或入库操作（这里只是打印信息）  
        System.out.println(Thread.currentThread().getName() + " 执行 " + type + " 操作，订单号：" + orderId);  
    }  
}  
public class OrderSystem {  
    // 订单号生成器，假设从1开始  
    private static final AtomicLong orderIdGenerator = new AtomicLong(1);  
    public static void main(String[] args) {  
        // 创建并启动多个线程模拟并发操作  
        Thread t1 = new Thread(new OrderTask("出库", orderIdGenerator), "出库线程1");  
        Thread t2 = new Thread(new OrderTask("入库", orderIdGenerator), "入库线程1");  
        Thread t3 = new Thread(new OrderTask("出库", orderIdGenerator), "出库线程2");  
        Thread t4 = new Thread(new OrderTask("入库", orderIdGenerator), "入库线程2");  
        // 启动所有线程  
        t1.start();  
        t2.start();  
        t3.start();  
        t4.start();  
        // 等待所有线程完成（可选，取决于你是否需要等待所有操作完成后再继续）  
        try {  
            t1.join();  
            t2.join();  
            t3.join();  
            t4.join();  
        } catch (InterruptedException e) {  
            e.printStackTrace();  
        }  
        // 如果不需要等待所有线程完成，可以省略上面的join调用  
        // ... 执行其他操作  
    }  
}