java多线程 notify()和wait()

java多线程 为什么这里结果为12A然后后边就不打印了，求指点

package homework11;


/*
 * 1.编写两个线程,一个线程打印1-52的整数, 另一个线程打印字母A-Z
 *      打印的顺序四
 *  12A34B56C...52Z
 */
public class homework11 {
    public static void main(String[] args) {
        Thread threadA = new Thread(new Runnable() {
            @Override
            public synchronized void run() {
                int i=1;
                while(i<=52){
                        System.out.print(i);
                        if(i%2==0) {
                            notify();
                            try {
                                wait();
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                        i++;
                    }
                }
        });
        Thread threadB = new Thread(new Runnable() {
            @Override
            public synchronized void run() {
                char c='A';
                while(c<=(char)90) {
                    System.out.print(c);
                    notify();
                    try {
                        wait();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    c=(char)(c+1);
                }
            }
        });
        threadA.start();
        try {
            Thread.sleep(10);//保证初始的线程执行顺序：A->B
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        threadB.start();
    }
}

运行结果

• 给你找了一篇非常好的博客，你可以看看是否有帮助，链接：Java之wait()和notify()实例讲解

捞捞，有好心人嘛！求解