Java多線程實現模擬12306火車站售票系統

public class Ticket {
    //起始站
    private String startStation;
    //終點站
    private String destination;
    /**POJO對象，它裡面的基本類型最好使用包裝類
     * 因為如果如果該類用來裝從數據庫中讀取的信息
     * 如果讀取出null，那麼基本類型是無法存null的，就會報錯*/
    //票價
    private Float price;
    public Ticket(){}

    public Ticket(String startStation, String destination, Float price) {
        this.startStation = startStation;
        this.destination = destination;
        this.price = price;
    }
    //為瞭讓打印輸出時方便，我們重寫toString方法
    public String toString() {
        StringBuilder builder = new StringBuilder("[");
        builder.append(this.startStation);
        builder.append("--->");
        builder.append(this.destination);
        builder.append("：");
        builder.append(this.price);
        builder.append("]");
        return builder.toString();
    }

    //get() and set()....

}

public class System12306 {
    //設計一個單例模式
    private System12306(){}
    private static volatile System12306 sys;
    public static System12306 getInstance(){
        if (sys == null){
            synchronized (System12306.class){
                if(sys == null)
                    sys = new System12306();
            }
        }
        return sys;
    }
    //屬性，用一個集合存票，我們使用線程安全的Vector，或者使用Stack，它繼承瞭Vector
    private Vector<Ticket> tickets = new Vector<>();
    private String[] starts = {"北京","天津","太原","運城","西安"};
    private String[] ends = {"上海","武漢","蘇州","深圳","昆明","廣州"};
    //當前系統創建後，就給tickets集合賦值
    {
        for(int i = 10;i<100;i++){//一共90張票
            int r1 = (int)(Math.random()*starts.length);
            int r2 = (int)(Math.random()*ends.length);
            float price = r1*r2*5+140;
            tickets.add(new Ticket(starts[r1],ends[r2],price));
        }
    }
    //設計一個方法，從集合中獲取一張票
    public Ticket getTicket(){
        try {
            return tickets.remove(0);
        }catch (Exception e){
            return null;
        }
    }
}

public class Window implements Runnable {
    private String windowName;//窗口的名字
    public Window(String windowName){
        this.windowName = windowName;
    }
    @Override
    public void run() {
        this.sellTicket();
    }
    public void sellTicket(){
        while (true){
            System12306 sys = System12306.getInstance();
            Ticket ticket = sys.getTicket();
            if(ticket==null){
                System.out.println("對不起，"+windowName+"窗口車票已售完...");
                break;
            }
            System.out.println("從"+windowName+"窗口售出："+ticket);
        }
    }
}

public class TestMain {
    public static void main(String[] args) {
        Window win1 = new Window("北京西站");
        Window win2 = new Window("運城北站");
        Window win3 = new Window("太原南站");
        new Thread(win1).start();
        new Thread(win2).start();
        new Thread(win3).start();
    }
}