Size in nullLayout from own components

hi there,
I have a null layout JPanel in which the user can add some components.
The height and the width of the components are different and can be changed, by setting a text into it and so on.....
I add the component by
setBound(x, y, 200, 200) x = x-coodinate y = y-coodinate
it works fine, but I want to add the component with its real width and real height not 200, 200.
how can I do that?
I wrote some methods for the component called setWholeWidth(int) and getWholeWidth()
If I call setWholeWidth() in the constructor it works but if I call setWholeWidth(int) in the paint-method it do not want to work. The wholeWidth variable is set but if the paint() method comes to its end, the variable will be reset to null
how can I fix this problem?
some additional informations: the user is able to manipulate the text, fontsize etc at runtime, wich means the size of the component could be changed every time

the problem is, the dimensions are set to 10, 10 and I cant manipulate them in paint(graphics g)
if I call setPrefferedSize(x, y) in the paint(graphics g) method, it wont take effect the dimension are still set to 10, 10

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