Java Swing How to - Update JComboBox while app is running

Question

We would like to know how to update JComboBox while app is running.

Answer

import java.awt.BorderLayout;
/* w w  w  . j ava2 s.  c  o m*/
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();

    String[] list = { "Hello 1", "Hello 2", "Hello 3", "Hello 4" };
    DefaultComboBoxModel<String> model = new DefaultComboBoxModel<>(list);
    JComboBox<String> comboBox = new JComboBox<>(model);
    frame.add(comboBox, BorderLayout.NORTH);

    final JTextField textField = new JTextField(30);
    frame.add(textField, BorderLayout.SOUTH);
    frame.add(new JLabel("Type something, then press enter", JLabel.CENTER));

    textField.addActionListener(ae -> {
      String text = textField.getText();
      model.addElement(text);
      comboBox.setSelectedItem(text);
      textField.setText("");

    });

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
  }
}