JDK8 IO包类梳理
流操作：
输入输出流
InputStream
SequenceInputStream
OutputStream
StringBufferInputStream
ObjectInputStream
ObjectInputStream.GetField
ObjectOutputStream
ObjectOutputStream.PutField
PipedInputStream
PipedOutputStream
BufferedInputStream
BufferedOutputStream
从流中读取/输出字节
ByteArrayInputStream
ByteArrayOutputStream
字符输入/输出流
CharArrayReader
CharArrayWriter
InputStreamReader
OutputStreamWriter
LineNumberInputStream
LineNumberReader
从字符输入流中读取/写文本
Reader
Writer
StringReader
StringWriter
PipedReader
PipedWriter
BufferedReader
BufferedWriter
基础输入流中操作基本Java数据类型
DataInputStream
DataOutputStream
对流提供额外功能
PrintStream
PrintWriter
FilterInputStream
FilterOutputStream
PushbackInputStream
PushbackReader
对流字符提供额外功能
FilterReader
FilterWriter
StreamTokenizer
文件操作：
文件
File
FileDescriptor
FilePermission
文件流
FileInputStream
FileOutputStream
字符文件
FileReader
FileWriter
类的序列化描述：
ObjectStreamClass
ObjectStreamField
SerializablePermission
RandomAccessFile
Console
java.nio
Buffer
ByteBuffer
ByteOrder
CharBuffer
DoubleBuffer
FloatBuffer
IntBuffer
LongBuffer
MappedByteBuffer
ShortBuffer
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