互斥共享

描述:模擬兩個售票員同時售票的情況,對電子票箱需要互斥共享。

//售票點(共享數據)
class Clerk{
    int ticket = 10;
    public synchronized void book(int tk){

        if(ticket>=tk) {
            System.out.println("book:" + tk);

            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            ticket = ticket - tk;
        }else{
            System.out.println("no ticket");
        }

        System.out.println("there are:"+ticket);
    }
}

//用戶訂票
class Booking extends Thread{

    private Clerk clerk;
    int num;
    public Booking(Clerk clerk,int num){

        this.clerk = clerk;
        this.num = num;
        this.start();//start();
    }

    public void run(){

        clerk.book(num);
    }

}
public class ticket {

    public static void main(String[] args) {
        Clerk clerk = new Clerk();
        new Booking(clerk,5);
        new Booking(clerk,10);
    }
}