[英]Java - Get reference to a static class using reflection
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. 它会出现错误,表明找不到类。 Can this be done?
可以这样做吗?
Have you tried referring to the nested class as 您是否尝试过将嵌套类称为
MyMainClass$SalesObjectGrouper1
Nested classes are internally named ContainingClassName$NestedClassName 嵌套类在内部命名为ContainingClassName $ NestedClassName
To avoid hacks in the mapping of Java language classes on to the Java runtime classes, you could use Class.getDeclaredClasses
. 为了避免将Java语言类映射到Java运行时类,您可以使用
Class.getDeclaredClasses
。 Using reflection is often a mistake. 使用反射通常是一个错误。 Dealing with nested classes does not seem to be a good sign.
处理嵌套类似乎不是一个好兆头。
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