流(IO)

字节输入流
Object
--------InputStream
              -------FileInputStream
                      （字节流 可直接操作文本文件）
                                                ---------BufferedInputStream
                                                          (带缓冲的字节输入流 是高级流）
                                                --------DateaInputSteam
                                                          (数据操作流 可操作基本数据类型 ，
                                                             高级流构造方法需要InputSteam对象）
                -------ByteArrayInputStream
                       （内存操作字节流，临时存储无参构造）
                -------SequenceInputStream
                       (合并流 合并多个文件）
                -------ObjecInputStream
                       (系列化流,存储对象网络高级流 构造需要的是InputStream的对象)
字节输出流
Object 
---------OutputStream
               ----------FileOutputStream
                         (字节流 可直接操作文本文件）
                                        --------------BufferedOutputStream
                                                        (带缓冲的字节输出流，高级流)
                                        --------------DataOutputSteam
                                                        (数据操作流 可操基本数据类型 需要OutputStream对象)
                                        --------------PrintStream
                                                        (打印流 与System.out.println()相关可直接操作文本文件)
                ----------ObjectOutputStream
                         (序列化流，高级流需要的是OutputStream的对象）
                ----------ByteArrayOutputStream
                         (内存操作流，无参构造）

---------RandomAccessFile
        (RandomAccessFile类不属于流，是Object类的子类。
        但它融合了InputStream和OutputStream的功能。
        支持对文件的随机访问读取和写入。)


字符输入流
Object
       ----Reader
        (读字符串的抽象类）

                        ---------------InputStreamReader
                                        (字节流通过字符流的桥梁，
                                        构造需要时InputStream的对象)
                                                                 -------------------FileReader
                                                                                   (读取文件的编辑字符输入流，
                                                                                       基本数据流）
                        ---------------CharArrayReader
                                        (字符型的内存操作流，构造需要字符数组)
                        ---------------StringReader
                                        (字符串型的内存操作流，构造需要是String)
                        ---------------BufferedReader
                                        (字符带缓冲的字符输入流需要的是Reader对象)
Object
            ----Writer
               (写字符串的抽象类）

                        ---------------OutputStreamWriter
                                        (字节流通过字符流的桥梁，
                                        构造需要时InputStream的对象)
                                                                 -------------------FileWriter
                                                                             (读取文件的编辑字符输入流，
                                                                                      基本数据流）

                        ---------------CharArrayWriter
                                        (字符型的内存操作流，构造需要字符数组)
                        ---------------StringWriter
                                        (字符串型的内存操作流，构造需要是String)
                        ---------------BufferedWriter
                                        (字符带缓冲的字符输入流需要的是Writer对象)
                        ---------------PrintWriter
                                        (字符打印流，可以直接操作文本文件）