/**

 * 子线程循环10次，接着主线程循环100次，接着又回到子线程循环10次，接着又 主线程循环100次，如此循环50次，请写出程序

 *

 * @author Administrator

 *

 */

public class TraditionalThreadCommunication {

    public static void main(String[] args) {

        final Business business = new Business();

        new Thread(new Runnable() {

            @Override

            public void run() {

                for (int i = 1; i <= 50; i++) {

                    business.sub(i);

                }

            }

        }).start();

        for (int i = 1; i <= 50; i++) {

            business.main(i);

        }

    }

}

/**
* 记住一个原则，把他们放到一个类上，自己管理自己的状态，不要让外边的线程去管
*/

class Business {

    private boolean isShoudeSub = true;

    /**

     * 同步加在需要访问的资源的代码上，不要放在线程上
　　　* 这样的好处是：以后我这个类 交给任何一个线程去访问，自然就同步了，不用考虑线程同步问题

     * @param i

     */

    public synchronized void sub(int i) {

        while (!isShoudeSub) {   //这里也可以用 if ，用while比较好一些  As in the one argument version, interrupts and spurious wakeups are possible, and this method should always be used in a loop

            try {                // 防止线程有可能被假唤醒 (while放在这里提现了水准)

                this.wait();

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        for (int j = 1; j <= 100; j++) {

            System.out

                    .println("sub thread sequence of " + j + ", loop of " + i);

        }

        isShoudeSub = false;

        this.notify();

    }

    public synchronized void main(int i) {

        while (isShoudeSub) {

            try {

                this.wait();

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        for (int j = 1; j <= 10; j++) {

            System.out.println("main thread sequence of " + j + ", loop of "

                    + i);

        }

        isShoudeSub = true;

        this.notify();

    }

    /**

     *

     * synchronized (obj) { 这里的obj与obj.wait必须是同一个对象，否则会抛异常

         while (<condition does not hold>)

             obj.wait();

         ... // Perform action appropriate to condition

     }

     */

}