字节流
InputStream
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FileInputStream
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FilterInputStream
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BufferedInputStream
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DataInputStream
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PushbackInputStream
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ObjectInputStream
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PipedInputStream
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ByteArrayInputStream
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StringBufferInputStream
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SequenceInputStream
OutputStream
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FileOutputStream
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FilterOutputStream
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BufferedOutputStream
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DataOutputStream
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PrintStream
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ObjectOutputStream
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PipedOutputStream
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ByteArrayOutputStream
字符流
Reader
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BufferedReader
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InputStreamReader
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FileReader
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StringReader
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PipedReader
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ByteArrayReader
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FilterReader
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PushbackReader
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Writer
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BufferedWriter
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OutputStreamWriter
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FileWriter
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PrinterWriter
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StringWriter
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PipedWriter
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CharArrayWriter
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FilterWriter