格式:

修饰符synchronized 返回值方法名(){

}

package com.itheima_05;
/*
 * 同步方法:使用关键字synchronized修饰的方法，一旦被一个线程访问，则整个方法全部锁住，其他线程则无法访问
 * 
 * synchronized
 * 注意：
 * 非静态同步方法的锁对象是this
 * 静态的同步方法的锁对象是当前类的字节码对象
 */
public class TicketThread implements Runnable {
static int tickets = 100;// 火车票数量
Object obj = new Object();

@Override
public void run() {
// 出售火车票
while (true) {
/*synchronized (obj) {
method();
}*/

//method();
method2();

}
}

private synchronized void method() {
if (tickets > 0) {
           
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

System.out.println(Thread.currentThread().getName() + ":" + tickets--);
}
}


private static synchronized void method2() {

if (tickets > 0) {

try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

System.out.println(Thread.currentThread().getName() + ":" + tickets--);
}
}



}
packagecom.itheima_05;
publicclassTicktetTest {
publicstaticvoidmain(String[] args) {
//创建线程对象
TicketThread tt = newTicketThread();
Thread t = newThread(tt);
t.setName("窗口1");
Thread t2 = newThread(tt);
t2.setName("窗口2");
Thread t3 = newThread(tt);
t3.setName("窗口3");
//启动线程对象
t.start();
t2.start();
t3.start();
}
}