class CoffeeShop {

private int availableSeats = 5; // 咖啡店有5个座位

private int customersServed = 0; // 已服务的顾客数

// 同步方法，为顾客提供服务

public synchronized void serveCustomer() {

if (availableSeats > 0) {

availableSeats--; // 减少可用座位数

customersServed++; // 增加已服务的顾客数

System.out.println("Customer served. Seats available: " + availableSeats + ". Total customers served: " + customersServed);

for(int i=0;i<100000;i++);

availableSeats++; // 服务完成后增加座位数

} else {

System.out.println("No seats available. Customer has to wait.");

}

}

}

class Waiter implements Runnable {

private CoffeeShop coffeeShop;

public Waiter(CoffeeShop coffeeShop) {

this.coffeeShop = coffeeShop;

}

@Override

public void run() {

for (int i = 0; i < 10; i++) {

coffeeShop.serveCustomer();

}

}

}

public class CoffeeShopExample {

public static void main(String[] args) {

CoffeeShop coffeeShop = new CoffeeShop();

// 创建多个服务员线程

Thread waiter1 = new Thread(new Waiter(coffeeShop));

Thread waiter2 = new Thread(new Waiter(coffeeShop));

waiter1.start();

waiter2.start();

}

}