Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
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来自: http://blog.csdn.net/sunny2038/article/details/6926079
最近在看Java,在编译写书上一个例子时,由于书上的代码只有一部分,于是就自己补了一个内部类。结果编译时出现: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 instance of E). E指代我写的那个内部类。
根据提示,没有可访问的内部类E的实例,必须分配一个合适的内部类E的实例(如x.new A(),x必须是E的实例。)看着这句提示,我就纳闷了,我已经用new实例化了这个类,为什么还不行呢。
于是百度谷歌了一下相关资料。原来我写的内部类是动态的,也就是开头以public class开头。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.
在这里记下这个问题,也方面遇到同样问题的朋友查阅。
另外:如果在类A中写一个内部类E,同时用main方法调用的话,则会出现上述错误;但如果将类E(不是内部类)写在类A外面,则不会出现上述错误。见代码如下(摘自《核心Java》第八版):
没有错误的情况:
有错误的情况:
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
- Java出现No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing
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