java160108ThisLockDemo

/**
 * 验证同步函数使用的锁是this
 */
package java160108;


/**
 * @author LiZheng
 *
 */
public class ThisLockDemo {


/**
* @param args
*/
public static void main(String[] args) {
Ticket3 ticket = new Ticket3();


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();
// thread3.start();
// thread4.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 Ticket3 implements Runnable {


private 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 (this) {
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 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--);
}

}




}