Java出現No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing

最近在看Java，在編譯寫書上一個例子時，因爲書上的代碼只有一部分，因而就本身補了一個內部類。結果編譯時出現：No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing instance of type E(e.g.  x.new A() where x is an ins

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