Java的多线程，程序、进程和线程的概念，实现多线程的两种方式，线程同步的原理，线程的死锁，运用wait和notify来实现producer - consumer关系，线程终止的两种情况。-Java multi-threading, procedures, process and thread the concept of the realization of multi-threaded in two ways, the principle of simultaneous threads, thread deadlock, the use of wait and notify to achieve producer- consumer relationship, thread termination the two situations.