Java多线程同步方法

同步方法: synchronized +方法
和上次的多线程锁synchronized一样,只是将东西封装与方法中

package homework;

//class SellTickets implements Runnable{
//    private int tickets=10000;
//    Object o=new Object();
//    @Override
//    public void run(){
//       while(true){//synchronized
//            synchronized(o) {
//
//               if (tickets > 0) {
//                   try {
//                       Thread.sleep(1);
//                   } catch (InterruptedException e) {
//                       e.printStackTrace();
//                   }
//                   System.out.println(Thread.currentThread().getName() + "购票成功:" + tickets--);
//               } else
//                   break;
//           }
//        }
//    }
//}
class SellTickets implements Runnable{
    private static  int tickets=1000;
    Object o=new Object();
    @Override
    public  void run(){
        while(true){//synchronized
//            synchronized(o) {
            show();

            }

    }
    public static synchronized void show(){//为何写static 因为main方法是定义了三和Sellticks类
        {
        if (tickets > 0) {
            try {
                Thread.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + "购票成功:" + tickets--);
        }
    }
    }
}



    public class test4 {
    public static void main(String[] args) {
        SellTickets s=new SellTickets();
        SellTickets s1=new SellTickets();
        SellTickets s2=new SellTickets();
        Thread w1=new Thread(s);
        Thread w2=new Thread(s1);
        Thread w3=new Thread(s2);
        w1.setName("窗口一：");
        w2.setName("窗口二：");
        w3.setName("窗口三：");

        w1.start();
        w2.start();
        w3.start();

    }

}