ticketsystem.java

页面置换算法 包括fifo 先进现出

package 操作系统;

public class TicketSystem {
	public static void main(String[] args) {
		SellThread st = new SellThread();
		AddThread as = new AddThread();
		new Thread(st).start();
		new Thread(st).start();
		new Thread(as).start();
		new Thread(as).start();

	}
}

class SellThread implements Runnable {
	static int Tickets = 100;

	public void run() {

		while (true) {

			if (Tickets > 0) {
				System.out.println(Thread.currentThread().getName() + "----"
						+ Tickets);
				Tickets--;
			}

		}

	}

}

class AddThread implements Runnable {

	public void run() {
		while (true) {
			if (SellThread.Tickets < 100) {
				System.out.println(Thread.currentThread().getName() + "+++++"
						+ SellThread.Tickets);
				SellThread.Tickets++;
			}
		}

	}
}