模擬售票，學習多線程

假設有火車票100張，創建10個線程模擬10個售票點，每個售票點隨機生成時間賣一張票。 打印出售票過程，注意使用synchronized確保同一張票只能賣出一次。

import java.text.SimpleDateFormat;
import java.util.Date;

public class Resource {

	int ticketNum;
	boolean flag = false;
	SimpleDateFormat sdf;

	int i = 1;

	public Resource(int ticketNum) {
		this.ticketNum = ticketNum;

		sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
	}

	public synchronized void sellTicket(Seller s) {
		if (i <= ticketNum) {
			System.out.println("在" + sdf.format(new Date()) + " 第" + s.num
					+ "售票點賣了第" + i + "張票...");
			i++;

		} else {
			flag = true;
		}
	}

}

public class Seller implements Runnable {

	int num;
	Resource rs;

	public Seller(int num, Resource rs) {
		super();
		this.num = num;
		this.rs = rs;
	}

	@Override
	public void run() {
		// TODO Auto-generated method stub
		while (rs.flag == false) {
			// 調用資源類的同步方法
			rs.sellTicket(this);
			try {
				// 生成隨機數(範圍1-1000)
				int random = (int) (Math.random() * 1000);
				Thread.sleep(random);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

}

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Resource rs = new Resource(100);
		for (int i = 0; i < 10; i++) {
			Thread t = new Thread(new Seller(i, rs));
			t.start();
		}
	}

}