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1. Vulgate usus

• Sit sit amet sem.XX users capto X tesseras simul。

1.1 Codex additicius sine obfirmatis

public class TicketDemo {
   

    // 票总数
    private int ticketNum = 10;

    /**
     * 抢票
     */
    public void getTicket() {
   
        if (ticketNum <= 0) {
   
            return;
        }
        System.out.println(Thread.currentThread().getName() + " 抢到一张票，剩余：" + ticketNum);
        // 非原子性操作
        ticketNum--;
    }

    /**
     * 测试：20个人抢一张票
     */
    public static void main(String[] args) {
   
        TicketDemo ticketDemo = new TicketDemo();
        for (int i = 0; i < 20; i++) {
   
            new Thread(ticketDemo::getTicket).start();
        }
    }
}
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Eventus:

Videre potes oversold quaestio , tesserae 10 sunt in summa. Cum 20 stamina in unum tesseras captant, 11 homines tesseras apprehensae videntur. Causa est, quia si utrumque stamina transibit, si simul reprehendo.

Ideo opus est ut tesseram claudat operandi ut unum tantum linum reprimere et operari simul tesseram deductionem possit.

1.2 Obfirmo code implementation

public class TicketDemo {
   

    // 锁
    private static Object lock = new Object();

    // 票总数
    private int ticketNum = 10;

    /**
     * 抢票
     */
    public void getTicket() {
   
        synchronized (lock) {
   
    
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