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Java IO(1) Overview
文件访问 网络访问 内存访问 线程之间的访问 (Pipes 管道) 缓冲 过滤 解析 读写文本 (Readers / Writers) 读写原始数据类型 (long, int 等) 读写对象
From ：http://tutorials.jenkov.com/java-io/overview.html
