IO按操作对象分类
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缓冲操作：BufferedInputStream、BufferedOutputStream、BufferedReader、BufferedWriter
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文件操作：FileInputStream、FileOutputStream、FileReader、FileWriter
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管道操作：PipedInputStream、PipedOutputStream、PipedReader、PipedWriter
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数组操作：ByteArrayInputStream、ByteArrayOutputStream、CharArrayReader、CharArrayWriter
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基本数据类型操作：DataInputStream、DataOutputStream
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对象序列化操作：ObjectInputStream、ObjectOutputStream
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转化控制：InputStreamReader、OutputStreamWriter
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打印控制：PrintWriter、PrintStream