java java中的顶级类是什么？
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What is a top level class in java?
提问by Harsha Jayamanna
- What is a top level class in java?
- What is the definition of a top level class in java ?
- java中的顶级类是什么？
- java中顶级类的定义是什么？
I know that this is a basic question, but i could not find a clear and simple answer for this question.
我知道这是一个基本问题，但我找不到这个问题的明确和简单的答案。
回答by yshavit
It's simply any class that's not a nested class. If your file is Foo.java, and your class is Foo, then it's a top level class.
它只是任何不是嵌套类的类。如果您的文件是 Foo.java，而您的类是 Foo，那么它就是顶级类。
// in Foo.java:
public class Foo { // top level class
public static class NestedBar { // nested class
}
}
I had always thought this was an informal term, but it turns out it's actually defined in the JLS:
我一直认为这是一个非正式的术语，但事实证明它实际上是在 JLS 中定义的：
A top level class is a class that is not a nested class.
A nested class is any class whose declaration occurs within the body of another class or interface.
顶级类是不是嵌套类的类。
嵌套类是其声明出现在另一个类或接口的主体内的任何类。
回答by Erivan
The definition posted is correct, maybe another definition could be: a top-level class is the defined class with the same name of the file '.java' where it's in. however, just as an observation, for the case showed, a nested (not a top-level) 'static' class has the same behavior of a top-level class, in terms of the interaction with the instance members of the class where it has been nested.
发布的定义是正确的，也许另一个定义可能是：顶级类是定义的类，其名称与文件“.java”相同。然而，就像观察一样，对于所显示的案例，嵌套（不是顶级）“静态”类具有与顶级类相同的行为，就与嵌套它的类的实例成员的交互而言。
