java线程同步-synchronized

模拟火车站售票案例

同步代码块：
public class Ticket implements Runnable {

int tickets = 100;//总票数
Object obj = new Object(); //锁对象

@Override
public void run() {
    //卖票
    while (true) {
        synchronized (obj) {
            if (tickets > 0) {
                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName() + "卖出了第" + (tickets--) + "张票");
            }
        }
    }
}

}

同步方法
public class Ticket implements Runnable {

int tickets = 100;//总票数
Object obj = new Object(); //锁对象

@Override
public void run() {
    //卖票
    while (true) {
        method();
    }
}

public synchronized void method(){
    if (tickets > 0) {
        try {
            Thread.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(Thread.currentThread().getName() + "卖出了第" + (tickets--) + "张票");
    }
}

}

测试类
public class TicketTest {
public static void main(String args[]){

    Ticket t = new Ticket();

    Thread t1 = new Thread(t);
    Thread t2 = new Thread(t);
    Thread t3 = new Thread(t);

    t1.setName("窗口1");
    t2.setName("窗口2");
    t3.setName("窗口3");

    t1.start();
    t2.start();
    t3.start();
}

}

java线程同步-synchronized

原文：http://blog.51cto.com/5731674/2087498