Java:synchronized

public class SynchronizedDemo {

    public static void main(String[] args) {
        MyThread thread1 = new MyThread("线程一");
        MyThread thread2 = new MyThread("线程二");
        thread1.start();
        thread2.start();
    }

    public synchronized void method1() {
        System.out.println("对象锁:方法");
    }

    public void method2() {
        synchronized (this) {
            System.out.println("对象锁:代码块");
        }
    }

    public static synchronized void method3() {
        System.out.println("类锁:方法");
    }

    public void method4() {
        synchronized (SynchronizedDemo.class) {
            System.out.println("类锁:代码块");
        }
    }

    static class MyThread extends Thread {

        // 100 张票
        private static int ticket = 100;

        public MyThread() {
            super();
        }

        public MyThread(String name) {
            super(name);
        }

        @Override
        public void run() {

            while (true) {

                synchronized (MyThread.class) {
                    if (ticket > 0) {
                        try {
                            Thread.sleep(100L);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        ticket--;
                        System.out.println(Thread.currentThread() + "卖掉了1张票，剩余票数为:" + ticket);
                    } else {
                        break;
                    }
                }

            }
        }
    }
}