D****6
发帖数: 278 | 1 public class A {
private static class B {
public static final String password = "1234567";
}
}
怎样获取password？ 如果B是个Field就好办了，就算是private也可以用
field.setAccessble(true);
可是对于private member class好像就没什么办法了？？ |
c*****t
发帖数: 1879 | 2 The class is not A, but A.B.
In Java, inner classes are just like any regular classes.
【在 D****6 的大作中提到】
: public class A {
:
: private static class B {
: public static final String password = "1234567";
: }
: }
: 怎样获取password？ 如果B是个Field就好办了，就算是private也可以用
: field.setAccessble(true);
: 可是对于private member class好像就没什么办法了？？
|
r*****l
发帖数: 2859 | 3 Based on the following paragraph from Oracle, I think access private class
using reflection is not possible, unless you are doing that within the
declaring outer class.
"Tip: An access restriction exists which prevents reflective invocation of
constructors which normally would not be accessible via direct invocation. (
This includes---but is not limited to---private constructors in a separate
class and public constructors in a separate private class.) However,
Constructor is declared to extend AccessibleObject which provides the
ability to suppress this check via AccessibleObject.setAccessible(). "
【在 D****6 的大作中提到】
: public class A {
:
: private static class B {
: public static final String password = "1234567";
: }
: }
: 怎样获取password？ 如果B是个Field就好办了，就算是private也可以用
: field.setAccessble(true);
: 可是对于private member class好像就没什么办法了？？
|
r*****l
发帖数: 2859 | 4 Well, you may be able to do it using java instrument. I am too lazy to do a
test though.
(
【在 r*****l 的大作中提到】
: Based on the following paragraph from Oracle, I think access private class
: using reflection is not possible, unless you are doing that within the
: declaring outer class.
: "Tip: An access restriction exists which prevents reflective invocation of
: constructors which normally would not be accessible via direct invocation. (
: This includes---but is not limited to---private constructors in a separate
: class and public constructors in a separate private class.) However,
: Constructor is declared to extend AccessibleObject which provides the
: ability to suppress this check via AccessibleObject.setAccessible(). "
|
x*****p
发帖数: 1707 | 5 Class c = A.class.getDeclaredClasses()[0];
Field f = c.getDeclaredField("password");
System.out.println(f.get(null)); |
r*****l
发帖数: 2859 | 6 不好好看题。B是private。Call getDeclaredFields的时候就会有
IllegalAccessException了。
【在 x*****p 的大作中提到】
: Class c = A.class.getDeclaredClasses()[0];
: Field f = c.getDeclaredField("password");
: System.out.println(f.get(null));
|
x*****p
发帖数: 1707 | 7 No way.
The code works perfectly. Do not justify by your understanding, running
result is number 1.
【在 r*****l 的大作中提到】
: 不好好看题。B是private。Call getDeclaredFields的时候就会有
: IllegalAccessException了。
|
r*****l
发帖数: 2859 | 8 oops, you are right. The result is 1234567 tough.
【在 x*****p 的大作中提到】
: No way.
: The code works perfectly. Do not justify by your understanding, running
: result is number 1.
|
