Java 类中的私有枚举位置
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Private enum location inside a class in Java
提问by miviclin
When declaring an enum inside a class in java I've seen these 2 approaches:
在 java 中的类中声明枚举时，我看到了这两种方法：
1)
1)
public class MyClass {
private enum MyEnum {
A, B, C;
}
/* Static fields */
/* Instance variables */
/* Methods */
}
2)
2)
public class MyClass {
/* Static fields */
/* Instance variables */
/* Methods */
private enum MyEnum {
A, B, C;
}
}
Which one is the most used? Is there any convention for this?
最常用的是哪一种？是否有任何约定？
采纳答案by Joel Christophel
Generally in Java, nested data types (e.g. classes, enums) go at the bottom of a file.
通常在 Java 中，嵌套数据类型（例如类、枚举）位于文件的底部。
However, for short, private enums like the one you posted (which feel more like fields), I'd go with #1.
但是，简而言之，像您发布的那样的私有枚举（感觉更像是字段），我会选择 #1。
For longer enums, I'd either go with #2 or put them in a separate file.
对于更长的枚举，我要么选择 #2，要么将它们放在一个单独的文件中。
回答by Troubleshoot
There isn't any convention used for it, but from what I've seen, example 1 is used more often. I personally place them in that way too.
没有使用任何约定，但从我所见，示例 1 的使用频率更高。我个人也以这种方式放置它们。
回答by Rupesh
Java does not have a typedefstatement (as in C and C++). To declare new types in Java, you declare a new class; then variables can be declared to be of that class's type. Also Java uses Forward references, java compiler is smarter than the C compiler, in that it allows methods to be invoked before they are defined. This eliminates the need to declare functions in a header file before defining them in a program file, as is done in C.
Java 没有typedef语句（如在 C 和 C++ 中）。要在 Java 中声明新类型，您需要声明一个新类；然后可以将变量声明为该类的类型。Java 也使用前向引用，Java 编译器比 C 编译器更聪明，因为它允许在定义方法之前调用它们。这消除了在程序文件中定义函数之前在头文件中声明函数的需要，就像在 C 中所做的那样。
I can place my enumanywhere and can access it from anywhere. Refer example.
我可以把我的enum任何地方都可以从任何地方访问它。参考例子。
class CheckEnum{
private void method1() {
System.out.println(enumTest.test1);
}
private enum enumTest{
test1
}
private void method2() {
System.out.println(enumTest.test1);
}
}
I have checked and both method method1and method2has access to enumTest.
我已经检查了这两种方法method1并且method2可以访问enumTest.
回答by Noris
There is nothing wrong with either of them. It's more a matter of opinion but I would go go #1.
他们中的任何一个都没有错。这更多是一个意见问题，但我会去#1。
