package threadjava;public class ThreadTest4 {    public static void main(String[] args) {        // TODO 自动生成的方法存根        //限定总票数为100张        Seller seller = new Seller(100);        //开放三个窗口售票        Worker w1 = new Worker(seller);        Worker w2 = new Worker(seller);        Worker w3 = new Worker(seller);    }    }//打印车票的机器，作为服务端可连接多个客户端运行使用class Seller {    private int[] tickets;     private int sold_line;        public Seller(int ticket_total) {        this.tickets = getTickets(ticket_total);        this.sold_line = ticket_total;    }        //该方法是个独占性方法，即同一时刻只允许一个线程调用    //也是java多线程进行同步操作的主要实现部分    public synchronized int sell() {        if(this.sold_line != 0){            int ticket_pos = (int)(Math.random()*this.sold_line);            int ticket = this.tickets[ticket_pos];            this.sold_line = this.sold_line - 1;            swap(this.tickets, ticket_pos, this.sold_line);            return ticket;        }else{            return -1;        }    }        private static void swap(int[] a, int x, int y){        int temp = a[x];        a[x] = a[y];        a[y] = temp;    }        private static void shfulle(int[] a) {        int x, y;        for(x=0; x<a.length; x++){            y = (int)(Math.random() * (x+1));            swap(a, x, y);        }    }        private static int[] getTickets(int total){        int i;        int[] a = new int[total];        for(i=0; i<total; i++){            a[i] = i;        }        shfulle(a);        return a;    }}//售票人员，被激活后就立即开始售票。哈哈，真是敬业~class Worker extends Thread {    private static int threadID = 0;    private Seller tickor;        public Worker(Seller seller) {        super("Ticket Seller NO." + (++threadID));        this.tickor = seller;        this.start();    }        public void run() {        while(true){            int ticket = this.tickor.sell();            if(ticket == -1){                System.out.println(this.getName() + ", sold out.");                break;            }else{                System.out.println(this.getName() + ", get ticket:" + ticket);            }        }    }}

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