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IO在计算机中表示输入和输出，java对IO进行抽象后构建了流，分为输入、输出流。根据数据处理方式又分为字节流和字符流。
# 一、字节流
字节流的顶级接口为InputStream、OutputStream
## 1.1 InputStream 字节输入流
## 1.2 OutputStream 字节输出流
# 二、字符流
字符流的顶级接口为Reader、Writer
# 三、流中使用的设计模式
