java中的Typeahead/Incremental Search

import javax.swing.*;
import javax.swing.text.DocumentFilter;
import java.awt.*;
import java.util.List;
import java.util.*;

public class TypeaheadSearch {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Typeahead Search Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 200);

        JTextField searchField = new JTextField(20);
        JList<String> searchResults = new JList<>();

        // 添加文本过滤器以实现实时搜索
        DocumentFilter filter = new TypeaheadDocumentFilter(searchResults);
        ((AbstractDocument) searchField.getDocument()).setDocumentFilter(filter);

        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        panel.add(searchField);
        panel.add(new JScrollPane(searchResults));

        frame.add(panel);
        frame.setVisible(true);
    }

    private static class TypeaheadDocumentFilter extends DocumentFilter {
        private final JList<String> searchResults;
        private final List<String> data = Arrays.asList("apple", "banana", "cherry", "date", "fig", "grape", "kiwi", "lemon", "mango", "nectarine", "orange", "pear", "quince", "raspberry", "strawberry", "tangerine", "watermelon");

        public TypeaheadDocumentFilter(JList<String> searchResults) {
            this.searchResults = searchResults;
        }

        @Override
        public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException {
            super.insertString(fb, offset, string, attr);
            searchResults.setListData(getMatchingResults(fb.getDocument().getText(0, fb.getDocument().getLength())).toArray(new String[0]));
        }

        @Override
        public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
            super.remove(fb, offset, length);
            searchResults.setListData(getMatchingResults(fb.getDocument().getText(0, fb.getDocument().getLength())).toArray(new String[0]));
        }

        @Override
        public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
            super.replace(fb, offset, length, text, attrs);
            searchResults.setListData(getMatchingResults(fb.getDocument().getText(0, fb.getDocument().getLength())).toArray(new String[0]));
        }

        private List<String> getMatchingResults(String query) {
            List<String> matchingResults = new ArrayList<>();
            for (String item : data) {
                if (item.toLowerCase().startsWith(query.toLowerCase())) {
                    matchingResults.add(item);
                }
            }
            return matchingResults;
        }
    }
}