Java IO流-InputStream是抽象类,也能调方法?(如图)
阿神
阿神 2017-04-18 10:55:26
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阿神
阿神

闭关修行中......

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大家讲道理

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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