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--); } } }
package com.itheima_05;
public class TicktetTest {
public static void main(String[] args) {
//创建线程对象
TicketThread tt = new TicketThread();
Thread t = new Thread(tt);
t.setName("窗口1");
Thread t2 = new Thread(tt);
t2.setName("窗口2");
Thread t3 = new Thread(tt);
t3.setName("窗口3");
//启动线程对象
t.start();
t2.start();
t3.start();
}
}
