Dynamically add JCombobox and JTextField

Question

I want to add a JComboBox and a JTextField to a panel when there is an item selected in the combobox.

I have this code for the panel.

aantallenGebruikt.add(new JTextField("", 5));
onderdelenGebruikt.add(new JComboBox(onderdelenBox()));
onderdelenGebruikt.get(0).addActionListener(MyFrame.this);

panelAfronden = new JPanel();
panelAfronden.setLayout(new FlowLayout());

panelAfronden.add(new JLabel("Selecteer onderdeelNr en Vul gebruikte aantallen in"));



panelAfronden2 = new JPanel();
panelAfronden2.setLayout(new FlowLayout());

panelAfronden2.add(onderdelenGebruikt.get(0));
panelAfronden2.add(aantallenGebruikt.get(0));

JScrollPane sPane = new JScrollPane(panelAfronden2);
sPane.setPreferredSize(new Dimension(220, 230));

panelAfronden.add(sPane);

panelAfronden.add(new JLabel("Opmerkingen"));
opmerkingenAfronden = new JTextArea(5, 20);
panelAfronden.add(opmerkingenAfronden);

rondAf = new JButton("Rond Werkzaamheid Af");
rondAf.addActionListener(MyFrame.this);
panelAfronden.add(rondAf);

annuleer = new JButton("Annuleer");
annuleer.addActionListener(MyFrame.this);
panelAfronden.add(annuleer);

I have this in the ActionListener

    if( eventSource == onderdelenGebruikt){
        System.out.println("test");
    }

I know how to add the combobox and textfield to the panel but At the moment it doesn't even print out the test to the console

Answer 1

Your Question:

I know how to add the combobox and textfield to the panel but At the moment it doesn't even print out the test to the console.

Answer:

Store the reference of JcomboBox some where and then check the source in ActionListener.

do in this way:

    final JComboBox comboBox = new JComboBox(onderdelenBox());
    onderdelenGebruikt.add(comboBox);

    comboBox.addActionListener(MyFrame.this);

Your ActionListener will look like this.

if( eventSource == comboBox ){
    System.out.println("test");
}