Retrieve public fields from class

Question

I want to use getFields() to retrieve public fields in a class but this is not working, the lenght of the array is always 0. Do I need to use getters or getDeclaredFields() ?

Field[] fields = gameClass.getFields();

The class contained in gameClass :

public class Solitaire {
public Board board = new Board("Board1", "");
public Layout layout = new Layout();
public Player player = new Player();}

Here how the class is loaded into gameClass : Load a class in a jar just with his name

Show us the definition of the actual class. And how you retrieved the gameClass variable. — RealSkeptic, Nov 15 '14 at 22:45
I recommend you to use gameClass.getName() in order to verify that you REALLY loaded the right class. — ale64bit, Nov 15 '14 at 23:13

score 0 · Accepted Answer · answered Nov 15 '14 at 23:20

0

I am doing the same thing -

Solitaire gameClass = new Solitaire();
Class gclass = gameClass.getClass();
Field[] fields = gclass.getFields();

And it's working perfectly for me :)

Entire test class -

import java.lang.reflect.Field;

public class Test {

    public static void main(String args[]) {

    Solitaire gameClass = new Solitaire();
    Class gclass = gameClass.getClass();
    Field[] fields = gclass.getFields();

    for (int i = 0; i < fields.length; i++) {
        System.out.println("field: " + fields[i]);
        }
    }
}

class Solitaire {

    public Solitaire a;
    protected String b;
    public String c;

    public Solitaire() {
    }
}

answered Nov 15 '14 at 23:20

Kartic

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Is the fact that I don't declare a constructor in solitaire a problem ? – Spooky Nov 15 '14 at 23:28
no, getFields() is supposed to return all public fields on the class (not private or package-protected though). It does not need a constructor which is for constructing object instances of the class, it needs only access to the class object. – marcelv3612 Nov 15 '14 at 23:30
Can you try using getDeclaredFields() and see what that returns? – marcelv3612 Nov 15 '14 at 23:31
Constructor declaration is not required actually. Are you sure, at least one field is public? – Kartic Nov 15 '14 at 23:33
It works, I don't know why this was not working, but it work and I have a new problem ... – Spooky Nov 15 '14 at 23:42
(surprising emoticon) Good luck :) – Kartic Nov 15 '14 at 23:45

Retrieve public fields from class

1 Answers1