Java tutorial
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.DefaultComboBoxModel; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; public class Main { public static void main(final String args[]) { final DefaultComboBoxModel<String> model = new DefaultComboBoxModel<String>(); model.addElement("A"); model.addElement("C"); model.addElement("D"); model.addElement("E"); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JComboBox<String> comboBox1 = new JComboBox<String>(model); comboBox1.setMaximumRowCount(5); comboBox1.setEditable(true); frame.add(comboBox1, BorderLayout.NORTH); JList<String> jlist = new JList<String>(model); JScrollPane scrollPane = new JScrollPane(jlist); frame.add(scrollPane, BorderLayout.CENTER); JButton button = new JButton("Add"); frame.add(button, BorderLayout.SOUTH); ActionListener actionListener = new ActionListener() { public void actionPerformed(ActionEvent actionEvent) { model.addElement("a"); } }; button.addActionListener(actionListener); frame.setSize(300, 200); frame.setVisible(true); } }