public static void main(String args[]) {
    JFrame frame = new JFrame();
    frame.setSize(450, 250);

    JTable table = new JTable(2, 1);

    TableColumn testColumn = table.getColumnModel().getColumn(0);

    JComboBox<String> comboBox = new JComboBox<String>();
    comboBox.addItem("Item1");
    comboBox.addItem("Item2");
    comboBox.addItem("Item3");
    testColumn.setCellEditor(new DefaultCellEditor(comboBox));

    comboBox.addItemListener(new ItemListener(){
        @Override
        public void itemStateChanged(ItemEvent e) {
            if (e.getStateChange() == ItemEvent.SELECTED){
                System.out.println(table.getValueAt(0, 0));
            }
        }
    });

    frame.add(table);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}