Enum.values() 在哪里定义的？

发布于 2024-08-02 12:00:55 字数 283 浏览 0 评论 0原文

每个Java枚举都有一个静态values()方法，可以像这样使用

for (MyEnum enum : MyEnum.values()) {
    // Do something with enum
}

但是，我不知道这个方法是在哪里定义的。 Javadoc 中没有提及它它不会出现在源文件中的任何位置。

原文

Every Java enumeration has a static values() method can be used like this

for (MyEnum enum : MyEnum.values()) {
    // Do something with enum
}

However, I cannot figure out where this method is defined. There's no mention of it in the Javadoc and it doesn't appear anywhere in the source file.

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聚集的泪 2024-08-09 12:00:55

这是 Java 语言规范所要求的： values 和 valueOf 将为所有 Enum 隐式声明：

/**
* Returns an array containing the constants of this enum 
* type, in the order they're declared.  This method may be
* used to iterate over the constants as follows:
*
*    for(E c : E.values())
*        System.out.println(c);
*
* @return an array containing the constants of this enum 
* type, in the order they're declared
*/
public static E[] values();

/**
* Returns the enum constant of this type with the specified
* name.
* The string must match exactly an identifier used to declare
* an enum constant in this type.  (Extraneous whitespace 
* characters are not permitted.)
* 
* @return the enum constant with the specified name
* @throws IllegalArgumentException if this enum type has no
* constant with the specified name
*/
public static E valueOf(String name);

这些方法是在编译时添加的，因此如果您使用 javap 反汇编代码，你实际上可以看看他们的身体。

This is required by the Java Language Specification: values and valueOf will be implicitly declared for all Enums:

/**
* Returns an array containing the constants of this enum 
* type, in the order they're declared.  This method may be
* used to iterate over the constants as follows:
*
*    for(E c : E.values())
*        System.out.println(c);
*
* @return an array containing the constants of this enum 
* type, in the order they're declared
*/
public static E[] values();

/**
* Returns the enum constant of this type with the specified
* name.
* The string must match exactly an identifier used to declare
* an enum constant in this type.  (Extraneous whitespace 
* characters are not permitted.)
* 
* @return the enum constant with the specified name
* @throws IllegalArgumentException if this enum type has no
* constant with the specified name
*/
public static E valueOf(String name);

These methods are added during compile time, so if you use javap to disassemble the code, you can actually look at their body.

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