1 使用线程控制，模拟买票卖票

import java.util.Random;

public class Seller
{
	public static void main(String[] args)
	{
		SellerTicket st = new SellerTicket();
		st.zhang.start();
		st.li.start();
		st.chen.start();
	}
}

class SellerTicket implements Runnable
{
	public int[] moneyArray =
	{
			5, 10, 20
	};
	public Random random = new Random();
	public Thread zhang;
	public Thread li;
	public Thread chen;

	public int fiveMoney = 1;
	public int tenMoney;
	public int twentyMoney;

	public SellerTicket()
	{
		zhang = new Thread(this);
		li = new Thread(this);
		chen = new Thread(this);
	}

	public void run()
	{
		while (true)
		{
			if(Thread.currentThread() == zhang)
			{
				seller(this.moneyArray[random.nextInt(3)]);
			}
			else if(Thread.currentThread() == li)
			{
				seller(this.moneyArray[random.nextInt(3)]);
			}
			else if(Thread.currentThread() == chen)
			{
				seller(this.moneyArray[random.nextInt(3)]);
			}
		}
	}

	public synchronized void seller(int receiveMoney)
	{
		if(receiveMoney == 5)
		{
			this.fiveMoney++;
			System.out.println("收您5块钱，这是您的票");
		}
		else if(receiveMoney == 10)
		{
			while (this.fiveMoney < 1)
			{
				System.out.println("对不起，10块钱太大了，请您等待...");
				try
				{
					wait();
				}
				catch (InterruptedException e)
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			this.tenMoney++;
			this.fiveMoney--;
			System.out.println("收您10块钱，找您5块钱，这是您的票");
		}
		else if(receiveMoney == 20)
		{
			while (this.fiveMoney < 1 || this.tenMoney < 1)
			{
				System.out.println("对不起，20块钱太大了，请您等待...");
				try
				{
					wait();
				}
				catch (InterruptedException e)
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			this.twentyMoney++;
			this.fiveMoney--;
			this.tenMoney--;
			System.out.println("收您20块钱，找您15块钱，这是您的票");
		}
		notifyAll();
	}

}

10 模拟买票卖票

原文：https://www.cnblogs.com/alichengxuyuan/p/12578053.html