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更新 'README.md'

肖中正 7 years ago
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     ```
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     ```
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   #打开控制台CMD,查看Java版本
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   #打开控制台CMD,查看Java版本
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-  > java --version
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+  > java -version
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   #查看Java编译器命令是否正常
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   #查看Java编译器命令是否正常
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   > javac
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   > javac
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     ```
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     ```

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