java Java通过反射创建一个枚举实例
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Java create an instance of enum via reflection
提问by michelemarcon
I want to get an instance to an enum type, so that:
我想获得一个枚举类型的实例,以便:
String enumString="abc";
MyClass.MyEnum enumType=Class.forName("com.MyClass.MyEnum."+enumString);
This gives me an inconvertible types.
这给了我一个不可转换的类型。
回答by ataylor
Enum.valueOfwill do it, but it is pretty picky about it's type. Make sure you cast the Class
to Class<? extends Enum>
. Example:
Enum.valueOf会做到这一点,但它对它的类型非常挑剔。确保你投射Class
到Class<? extends Enum>
. 例子:
enum Foo {
BLAT,
BLARG
};
System.out.println(Enum.valueOf((Class<? extends Enum>)Class.forName("Foo"), "BLARG"));
回答by Andy Thomas
回答by Yishai
You are looking for MyClass.MyEnum.valueOf(enumString)
. No need to fully qualify the class in the string.
您正在寻找MyClass.MyEnum.valueOf(enumString)
. 无需完全限定字符串中的类。