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<META HTTP-EQUIV="Context-Type" CONTEXT="text/html;charset=windows-1252">
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<TITLE>Interfaces</TITLE>
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<H1>Interfaces</H1>
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<LI> are special kinds of abstract classes that :
<UL>
<LI> can抰 have any implementation,
<LI> must be 搃mplemented⌨️ 快捷键说明
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