Java Swing中的自动完成文本框

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class AutoCompleteTextField {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Auto Complete Text Field");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 200);

        JTextField textField = new JTextField();
        JList<String> list = new JList<>(new DefaultListModel<>());

        // Add some sample items to the list
        DefaultListModel<String> model = (DefaultListModel<String>) list.getModel();
        model.addElement("Apple");
        model.addElement("Banana");
        model.addElement("Cherry");
        model.addElement("Date");
        model.addElement("Eggplant");

        // Add a key listener to the text field to update the list as the user types
        textField.addKeyListener(new KeyAdapter() {
            @Override
            public void keyReleased(KeyEvent e) {
                String text = textField.getText();
                if (text.isEmpty()) {
                    list.setVisible(false);
                    return;
                }
                list.setVisible(true);

                DefaultListModel<String> model = (DefaultListModel<String>) list.getModel();
                model.clear();

                // Filter the items in the list based on the text in the text field
                for (int i = 0; i< model.getSize(); i++) {
                    String item = model.getElementAt(i);
                    if (item.toLowerCase().contains(text.toLowerCase())) {
                        model.addElement(item);
                    }
                }
            }
        });

        // Add a mouse listener to the list to update the text field when the user selects an item
        list.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 1) {
                    int index = list.locationToIndex(e.getPoint());
                    if (index != -1) {
                        String item = list.getModel().getElementAt(index);
                        textField.setText(item);
                        list.setVisible(false);
                    }
                }
            }
        });

        // Add the text field and list to a panel and add the panel to the frame
        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.add(textField, BorderLayout.NORTH);
        panel.add(list, BorderLayout.SOUTH);
        frame.add(panel);

        frame.setVisible(true);
    }
}