When running the code below, all parts of the JComboBox are colored when setEditor = true; However when setEditor = false, only the drop-down list can be colored.

It seems the entry field looks like "disabled" without any way to change its color. I tried to issue a setEnabled() for this part, but with no success. I have also tried many other things for months but all failed.

Is there a solution?

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.Color;
import java.awt.Component;
import javax.swing.ComboBoxEditor;
import javax.swing.DefaultListCellRenderer;

public class CustomComboBox
{
    public static void main(String[] args)
    {
        String[] items = { "Apples", "Bananas", "Cherries", "Oranges" };
 
        JFrame frame = new JFrame("JComboBox Custom Colors");
            frame.setSize(213, 200);
            frame.getContentPane().setLayout(null);
 
        JButton Finish = new JButton("Exit");
            Finish.addActionListener(e -> System.exit(0));
            Finish.setBounds(43, 133, 100, 23);
 
        JComboBox<String> comboBox = new JComboBox<String>(items);
            comboBox.setBounds(43, 23, 101, 20);
            comboBox.setRenderer(new DefaultListCellRenderer()
            {
                private static final long serialVersionUID = 1L;
                @Override
                public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected,
                    boolean cellHasFocus)
                {
                    Component renderer = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
                    renderer.setForeground(Color.BLACK);
                    renderer.setBackground(Color.pink);
                    return renderer;
                }
            });
 
            JPanel panel = new JPanel();
                panel.setLayout(null);
                panel.setBounds(10, 10, 193, 179);
                panel.setBackground(new Color(102, 205, 170));
                panel.add(comboBox);
                panel.add(Finish);
 
            frame.getContentPane().add(panel);
 
        // coloring  the entry field
        ComboBoxEditor cedit = comboBox.getEditor();
        JTextField texte = (JTextField) cedit.getEditorComponent();
        texte.setBackground(Color.green);
        texte.setForeground(Color.red);
        cedit.setItem(texte);
        comboBox.setEditor(cedit);
 
        /*  Cannot be colored when changing "true" by  "false"   */
        comboBox.setEditable(true); 
        // comboBox.setEditable(false); 
        /*  */
 
        frame.setUndecorated(true);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}