On 2/1/2015 9:13 AM, Arne Vajh?j wrote:
On 2/1/2015 6:40 AM, Philipp Kraus wrote:
I see this is a conceptional design error at my code. I use my variable x
within a deeper framewok call and this call runs
x.getclass.getDecalredFields(), but
this returns in the example case nothing, ebcause my child class does
not have any fields.
I have got only the x reference but I need all fields of the object,
also the fields of the child & parent
class and fields of the parent-parent class... I would like to create a
field list from my object x over all
fields that are exists within the objects. IMHO I must run from my
object class up to the java.object and collect all fields.
How can I do this?
You recurse.
First getDeclaredFields() and then getSuperclass() and process that.
Demo:
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
public class AllFields {
private static void analyze(Class<?> clz, List<Field> fields) {
for(Field f : clz.getDeclaredFields()) fields.add(f);
if(!clz.getSuperclass().equals(Object.class))
analyze(clz.getSuperclass(), fields);
}
public static void dump(Object o) {
System.out.println(o.getClass().getName());
List<Field> fields = new ArrayList<>();
analyze(o.getClass(), fields);
for(Field f : fields) {
System.out.println(" " + f.getName());
}
}
public static void main(String[] args) {
dump(new A());
dump(new B());
dump(new C());
}
}
class A {
private Object a;
}
class B extends A {
private Object b;
}
class C extends B {
private Object c;
}
Arne