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並前往https://softwareengineering.stackexchange.com/questions/389842/why-is-this-valid-boolean-b-new-a-instanceof-a-if-a-is-an-abstract-class

Why is this valid boolean b = new A() {} instanceof A; if A is an ...

The instanceof A has nothing to do with whether the statement is valid or not, so your question is simpler if you leave it off from both ...

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