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Using reflection to change the structure of an object

From wikipedia :

reflection is the ability of a computer program to examine and modify the structure and behavior (in particular, the values, metadata, properties and functions) of an object at runtime.

Can someone give me a concrete example of changing the structure of an object? I know the following example.

Object foo = Class.forName("complete.classpath.and.Foo").newInstance();
Method m = foo.getClass().getDeclaredMethod("hello", new Class<?>[0]);
m.invoke(foo);

Other ways to get a class and learn structures. But the questions are, how is the modification done?

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In java, reflection is not fully supported, as defined in wikipedia.

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(java.lang.reflect) - , - setAccessible, , . http://ru.wikipedia.org/wiki/Byte_Code_Engineering_Library , Java

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