Java - 使用反射获取对静态类的引用
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Java - Get reference to a static class using reflection
提问by Andez
In Java, is it possible to access an instance of a static class (nested) using reflection?
在 Java 中，是否可以使用反射访问静态类（嵌套）的实例？
Supposing I have the following 2 classes defined in the package Package1.SubPackage.SubSubPackage:
假设我在Package1.SubPackage.SubSubPackage包中定义了以下 2 个类：
public class MyMainClass {
public static class SalesObjectGrouper1 {
public static final GrouperContext CONTEXT = new GrouperContext("MyDate");
}
private static class SalesObjectGrouper2 {
public static final GrouperContext CONTEXT = new GrouperContext("MyDate");
}
}
If I run the following code:
如果我运行以下代码：
try {
xyz = Class.forName( "Package1.SubPackage.SubSubPackage.MyMainClass.SalesObjectGrouper1" );
} catch( ClassNotFoundException ex ) {
// always hit the error
}
it will error indicating class cannot be found. Can this be done?
它将错误指示找不到类。这能做到吗？
回答by Jim Garrison
Have you tried referring to the nested class as
您是否尝试将嵌套类称为
MyMainClass$SalesObjectGrouper1
Nested classes are internally named ContainingClassName$NestedClassName
嵌套类在内部命名为 ContainingClassName$NestedClassName
回答by Tom Hawtin - tackline
To avoid hacks in the mapping of Java language classes on to the Java runtime classes, you could use Class.getDeclaredClasses. Using reflection is often a mistake. Dealing with nested classes does not seem to be a good sign.
为了避免在 Java 语言类到 Java 运行时类的映射过程中出现问题，您可以使用Class.getDeclaredClasses. 使用反射通常是错误的。处理嵌套类似乎不是一个好兆头。
