[Solved] How to do test on Item selected In JCombobox

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A couple of comments regarding your code.
You should mark your fields as private and then access to them trough getter/setter.

class RF
{
private final String nom;
private final String ref;
private final String num;

I don’t know why they are final (I don’t hink they should) anyway. Then

 RF n = (RF) jComboBox1.getSelectedItem();

For sure this throws a ClassCastException, so this line is never reached

 if(!(n.num.equals(""))) // dont work !!

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solved How to do test on Item selected In JCombobox