fix Class.getInterface() -> Class.getInterfaces()#392

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sjsdfg merged 6 commits intolingcoder:masterfrom

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Mar 4, 2020

Commits on Feb 27, 2020

忽路->忽略
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Commits on Feb 28, 2020

修复跳转链接错误
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Commits on Feb 29, 2020

Merge branch 'master' of github.com:LingCoder/OnJava8
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Commits on Mar 3, 2020

fix Class.getInterface() -> Class.getInterfaces()
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否者 -> 否则
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编译期 -> 编译器，原文"the compiler will only allow you to say that the superclass reference is “some class that is a superclass of FancyToy” a"
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