How to access the inner class fields in refleciton?

I have:

class Outer {
    class Inner {
        int field;
    }
    Inner inner;
}

I use reflection to get the Outer.field field and recognize that it is a reference to the inner class. What should I do to get the inner.field (or something that looks remotely like this at Inner.field)?

We would like to

Well, precedent is too messy for me even follow my example. I've simplified it, and I think I found where my error was. I suspect that you were doing a similar error:

package scratch;

import java.lang.reflect.Field;

public class Scratch {

  public static void main(String[] args) throws Exception {
    new Scratch().go();
  }

  void go() {
    Outer1 o1;

    Field[] fields = Outer1.class.getDeclaredFields ();

    for (Field field : fields) {

      final String fn = field.getName ();
      final Class ft = field.getType ();
      final Class fc = field.getClass ();
      final Class fdc = field.getDeclaringClass ();

      System.out.println ();

      System.out.println ("Outer1 field : " + fn);

      System.out.println ();

      System.out.println ("field's class (field.getType()) : " + ft.getName());
      System.out.println ("field.getType().isMemberClass() (" + ft.getName() +" isMemberClass()) : " + ft.isMemberClass ());
      System.out.println ("field.getType(). getDeclaringClass() (" + ft.getName() + "'s declaring class) : " + fdc);

      System.out.println ();

      System.out.println ("field.getClass()) : " + fc.getName());
      System.out.println ("field.getClass().isMemberClass() (" + fc.getName() +" isMemberClass()) : " + fc.isMemberClass ());
      System.out.println ("field.getClass().getDeclaringClass() (" + fc.getName() + "'s declaring class) : " + fc.getDeclaringClass ());

      System.out.println ();

      System.out.println ("Note the difference between Field.getClass() (" + field.getClass () + ") and Field.getType() (" + field.getType() + ")");

      System.out.println ();
    }
  }
}

class Outer1 {
  class Inner1 {
  }

  Inner1 i1;
}

Outer1 field : i1

field's class (field.getType()) : scratch.Outer1$Inner1
field.getType().isMemberClass() (scratch.Outer1$Inner1 isMemberClass()) : true
field.getType(). getDeclaringClass() (scratch.Outer1$Inner1's declaring class) : class scratch.Outer1

field.getClass()) : java.lang.reflect.Field
field.getClass().isMemberClass() (java.lang.reflect.Field isMemberClass()) : false
field.getClass().getDeclaringClass() (java.lang.reflect.Field's declaring class) : null

Note the difference between Field.getClass() (class java.lang.reflect.Field) and Field.getType() (class scratch.Outer1$Inner1)

field.getClass () does NOT get the class of the field. It get the class of the field object that points to the field reference variable, which is always java.lang.reflect.Field. To get the class of the field, use field.getType ().

Do you see the difference?

Edited by: jverd February 5, 2011 17:18

Tags: Java

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How to access the inner class fields in refleciton?

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