How to Dynamically Populate Dependent JComboBoxes in Java?

Implementing Dynamic JComboBoxes

To populate data dynamically in JComboBoxes, you can leverage ComboBoxModel and manipulate the model of the dependent JComboBox.

Implementation:

1. DataModel Creation:
   Create an array of ComboBoxModel objects, each representing a set of data corresponding to a specific JComboBox.

2. Model Initialization:
   Initialize each model with the corresponding data values, as shown in the example:

   models[0] = new DefaultComboBoxModel(new String[]{"A1", "A2"});
   models[1] = new DefaultComboBoxModel(new String[]{"B1", "B2", "B3", "B4"});
   models[2] = new DefaultComboBoxModel(new String[]{"C1", "C2"});

3. Initial Model Setting:
   Initially, set the model of the dependent JComboBox to the model of the selected option in the main JComboBox:

   combo2.setModel(models[combo1.getSelectedIndex()]);

4. Event Handling:
   Add an ActionListener to the main JComboBox to capture changes in selection. When the selection changes, update the model of the dependent JComboBox.

   combo1.addActionListener(new ActionListener() {
       @Override
       public void actionPerformed(ActionEvent e) {
           int i = combo1.getSelectedIndex();
           combo2.setModel(models[i]);
       }
   });

By following these steps, you can implement dynamic JComboBoxes that populate the dependent JComboBox with relevant data based on the selection made in the main JComboBox.

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