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【多选题】
关于 Java中字节流和字符流,哪些说法是正确的?( )
A.
数据流的来源和去向包括：文件、网络、内存等等设备。
B.
InputStream和Reader是读入流，它们都是抽象类
C.
OutPutStream和Writer是输出流，它们都是抽象类。
D.
读、写数据的方法都抛出运行时异常。
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