Java最出色的一个地方就是它的"无痛苦连网"概念。有关连网的基层细节已被尽可能地提取出去，并隐藏在JVM以及Java的本机安装系统里进行控制。-The best place in Java is the " no pain networking concept. Grassroots details about networking as much as possible to extract out and hide in the JVM and Java native instal