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Java IO流-InputStream是抽象类，也能调方法？（如图）

阿神阿神2804 days ago532

reply all(1)I'll reply

  • 大家讲道理

    大家讲道理2017-04-18 10:57:26

    The class is the definition, and the caller of the method is the instance that implements the abstract method.
    Ps, it is recommended that the system read a Java book

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