/** * 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 (
     
      )             obj.wait();         ... // Perform action appropriate to condition     }     */}