本章是重头戏：网络编程！
1、首先测试一下daytime服务：
telnet time.nist.gov 13
Trying 192.43.244.18...
Connected to ntp.glb.nist.gov.
Escape character is '^]'.
55965 12-02-08 12:34:39 00 0 0 612.3 UTC(NIST) *
Connection closed by foreign host.
这个过程中[......]
Java核心技术卷II(第8版) – 读书笔记 – 第3章
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