在编译一个例子时，结果编译时出现：

No enclosing instance of type test8 is accessible. Must qualify the allocation with an enclosing instance of type W (e.g. x.new A() where x is an instance of W).

(W为文件名)

根据提示，没有可访问的内部类W的实例，必须分配一个合适的内部类W的实例（如x.new A()，x必须是W的实例。）

但是我已经实例化了这个类，为什么还不行呢。

经过查询相关资料。原来我写的内部类是动态的，也就是开头以public class开头，或者默认的为动态的。而主程序是public static class main。在Java中，类中的静态方法不能直接调用动态方法。只有将某个内部类修饰为静态类，然后才能够在静态类中调用该类的成员变量与成员方法。所以解决办法是将public class改为public static class.

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