这是好几个java多线程的学习程序，主要测试多线程的同步，join，以及实现多线程的两种方法（继承Thread类，实现runnable接口），代码完全正确，但是仅仅适用于多线程的初学者，用于学习，不用于具体工程-This is a few java multi-threaded learning procedures, the main test multi-threaded synchronization, join, and the realization of multi-threaded two methods (inherited Thread class, to achieve runnable interface), the code is correct, but only for multi-threaded early Scholars, used for learning, not for specific projects