博客主要介绍Java相关知识，包括异常处理，指出异常是从错误处抛出的对象，处理异常是不同的并行执行路径，且不可忽视；还提及多线程，Java将线程融入语言，用synchronized关键字解决资源共享问题，此外还涉及持久化和Java与互联网的客户端/服务器计算。
1.8 Exception handling: dealing with errors
An exception is an object thrown from the site of the error.
Exception handling is like a different, parallel path of execution.
Exception canot be ignored.
Excetion provide a way to reliably recover from a bad situation.
1.9 Multithreading
Here is an interesing part.
Java builds threads into language, then without hardware suspension, the program is logically divided into threads.
And to solve the problem of share recources, Java enables a thread to lock a resource.This is accomplished using the synchronized keyword.
1.10 Persistence
1.11 Java and the Internet
client/server computing
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