子线程循环10次，接着主线程循环100，接着又回到子线程循环10次，接着再回到主线程又循环100，如此循环50次，请写出程序。

/**
 * 子线程循环10次，接着主线程循环100，接着又回到子线程循环10次，接着再回到主线程又循环100，如此循环50次，请写出程序。
 * @author lijinnan
 * @date:2013-11-5 下午3:07:10  
 */
public class ThreadComunication {

    private static final int ROUND_COUNT = 50;
    
    public static void main(String[] args) {
        
        //主线程和子线程“共享”一个Busines实例
        final Business business = new Business();
        
        /*
        //主线程
        for (int i = 0; i < ROUND_COUNT; i++) {
            business.main(i);
        }
        */
        
        //子线程-注意要先启动子线程，否则子线程不会启动，主线程在roundIndex=0执行完毕后就陷入无限等待
        new Thread(new Runnable() {
            
            @Override
            public void run() {
                for (int i = 0; i < ROUND_COUNT; i++) {
                    business.sub(i);
                }
            }
            
        }).start();
        
        //主线程
        for (int i = 0; i < ROUND_COUNT; i++) {
            business.main(i);
        }
    }

}


class Business {
    
    private static final int SUB_COUNT = 10;
    private static final int MAIN_COUNT = 100;
    
    private boolean doSub;
    
    public synchronized void sub(int roundIndex) {
        while (!doSub) {
            try {
                wait();
            } catch (InterruptedException e) {
                //ignore
            }
        } 
        for (int i = 0; i < SUB_COUNT; i++) {
            System.out.println("sub " + i + " of " + roundIndex);
        }
        doSub = false;
        notifyAll();
    }
    
    public synchronized void main(int roundIndex) {
        while (doSub) {
            try {
                wait();
            } catch (InterruptedException e) {
                //ignore
            }
        } 
        for (int i = 0; i < MAIN_COUNT; i++) {
            System.out.println("main " + i + " of " + roundIndex);
        }
        doSub = true;
        notifyAll();
    }
    
}