how to control a combo box by using another combo box swing

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Check out how to work with models in How to Use Combo Boxes and How to Use Lists totorials. According to a selection in the first combo box – rebuild, filter or perhaps replace the model of the second combo box. You can use/extend DefaultComboBoxModel – a default model used by a JComboBox. For example consider this snippet:

final JComboBox genderComboBox = null;
final JComboBox itemComboBox = null;

final DefaultComboBoxModel hisModel = new DefaultComboBoxModel(new String[]{"a", "b", "c"});
final DefaultComboBoxModel herModel = new DefaultComboBoxModel(new String[]{"x", "y", "z"});

genderComboBox.addActionListener (new ActionListener () {
    public void actionPerformed(ActionEvent e) {
        if ("Men".equals(genderComboBox.getSelectedItem())){
            itemComboBox.setModel(hisModel);    
        } else {
            itemComboBox.setModel(herModel);    
        }
    }
});

Alternatively, upon selection in the first combo you can rebuild the items in the second one manually, ie: using JComboBox methods removeAllItems() and addItem().

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