nio的主要作用就是用来解决速度差异的。举个例子：计算机处理的速度，和用户按键盘的速度。这两者的速度相差悬殊。如果按照经典的方法：一个用户设定一个线程，专门等待用户的输入，无形中就造成了严重的资源浪费：每一个线程都需要珍贵的cpu时间片，由于速度差异造成了在这个交互线程中的cpu都用来等待-nio' s main role is to solve the speed difference. For example: computer processing speed, and the user presses the keyboard speed. Significant differences between the speed of the two. According to the classical methods: a user to set a thread dedicated to waiting for user input, is somehow causing a serious waste of resources: all need each thread' s cpu precious time slices, because of the speed difference caused in this interactive Xiancheng the cpu have to wait