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populate data in text fields after selecting combo box list

Ferry Lukito
Posts: 8
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I have problem with populating text fields upon selecting item in the combo box. I have 2 class, 1 to handle the GUI and the other, Controller to handle the database. Controller constructor takes the GUI as an input.
This is what I did in simplified version:
------------- GUI Class ------------
JComboBox combobox = new JComboBox();

public void comboboxListener(ActionListener al)

GUI.comboboxListener(new combolistener());

class combolistener implements ActionListener{
public void actionPerformed(ActionEvent ae){
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