java160108StaticMethodDemo

/**

* 如果同步函数诶静态函数修饰后,使用的所是什么呢?

* 通过验证:发现不是this

*/

package java160108;

/**

* @author LiZheng

*

*/

public class StaticMethodDemo {

/**

* @param args

*/

public static void main(String[] args) {

Ticket4 ticket = new Ticket4();

Thread thread1 = new Thread(ticket);

Thread thread2 = new Thread(ticket);

// Thread thread3 = new Thread(ticket);

// Thread thread4 = new Thread(ticket);

thread1.start();

try {

Thread.sleep(10);//10毫秒

} catch (Exception e) {

e.printStackTrace();

}

ticket.flag=false;

thread2.start();

}

}

//要注意同步的代码是那一部分

//同步函数用的当前对象

class Ticket4 implements Runnable {

private static int tick = 1000;

Object obj = new Object();

boolean flag=true;

@Override

public void run() {

if (flag) {

while (true) {

// synchronized同步代码块的关键字,参考火车卫生间是否有人

synchronized (Ticket4.class) {

if (tick>0) {

try {

// 此处会引发多线程的问题

Thread.sleep(10);

} catch (Exception e) {

e.printStackTrace();

}

System.out.println(Thread.currentThread().getName() + "...code..." + tick--);

}

}

// show();//this.show();

}

}else {

while (true) {

show();

}

}

}

public static synchronized void show() {

if (tick > 0) {

try {

// 此处会引发多线程的问题

Thread.sleep(10);

} catch (InterruptedException e) {

e.printStackTrace();

}

System.out.println(Thread.currentThread().getName() + "...show..." + tick--);

}

}

}