我使用了另一种方法：
它使用一个称为的自定义类，该类
AutoSuggestor接受
a JTextField，其单词
Windowan ArrayList<String>来检查输入的单词，背景颜色和文本颜色以及建议焦点颜色以及不透明度值。通过传递
JTextField引用
documentListener，将添加a，它将执行以下操作：检查键入的单词以及是否显示建议以及是否显示建议。当一个单词键入的
documentListener意志火
wordTyped(String wordTyped)法与当前字所键入或（至少多少字有史以来已经输入），在
wordTyped(..)这个词将被检查对那些在AutoSuggestor小号类 字典这是一个基本
ArrayList的
String这罐如下面的示例所示，可以即时设置：
在此处输入图片说明
（现在你将不得不使用鼠标单击要进行自动补全的词，或使用DOWN横向建议，该文本框，并ENTER使用遍历时选择的建议下键我还没有实现。UP还）：
import java.awt.Color;import java.awt.Dimension;import java.awt.GridLayout;import java.awt.Window;import java.awt.event.ActionEvent;import java.awt.event.KeyEvent;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.util.ArrayList;import javax.swing.AbstractAction;import javax.swing.JComponent;import javax.swing.Jframe;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.JWindow;import javax.swing.KeyStroke;import javax.swing.SwingUtilities;import javax.swing.border.LineBorder;import javax.swing.event.documentEvent;import javax.swing.event.documentListener;public class Test { public Test() { Jframe frame = new Jframe(); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); JTextField f = new JTextField(10); AutoSuggestor autoSuggestor = new AutoSuggestor(f, frame, null, Color.WHITE.brighter(), Color.BLUE, Color.RED, 0.75f) { @Override boolean wordTyped(String typedWord) { //create list for dictionary this in your case might be done via calling a method which queries db and returns results as arraylist ArrayList<String> words = new ArrayList<>(); words.add("hello"); words.add("heritage"); words.add("happiness"); words.add("goodbye"); words.add("cruel"); words.add("car"); words.add("war"); words.add("will"); words.add("world"); words.add("wall"); setDictionary(words); //addToDictionary("bye");//adds a single word return super.wordTyped(typedWord);//now call super to check for any matches against newest dictionary } }; JPanel p = new JPanel(); p.add(f); frame.add(p); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new Test(); } }); }}class AutoSuggestor { private final JTextField textField; private final Window container; private JPanel suggestionsPanel; private JWindow autoSuggestionPopUpWindow; private String typedWord; private final ArrayList<String> dictionary = new ArrayList<>(); private int currentIndexOfSpace, tW, tH; private documentListener documentListener = new documentListener() { @Override public void insertUpdate(documentEvent de) { checkForAndShowSuggestions(); } @Override public void removeUpdate(documentEvent de) { checkForAndShowSuggestions(); } @Override public void changedUpdate(documentEvent de) { checkForAndShowSuggestions(); } }; private final Color suggestionsTextColor; private final Color suggestionFocusedColor; public AutoSuggestor(JTextField textField, Window mainWindow, ArrayList<String> words, Color popUpBackground, Color textColor, Color suggestionFocusedColor, float opacity) { this.textField = textField; this.suggestionsTextColor = textColor; this.container = mainWindow; this.suggestionFocusedColor = suggestionFocusedColor; this.textField.getdocument().adddocumentListener(documentListener); setDictionary(words); typedWord = ""; currentIndexOfSpace = 0; tW = 0; tH = 0; autoSuggestionPopUpWindow = new JWindow(mainWindow); autoSuggestionPopUpWindow.setOpacity(opacity); suggestionsPanel = new JPanel(); suggestionsPanel.setLayout(new GridLayout(0, 1)); suggestionsPanel.setBackground(popUpBackground); addKeyBindingToRequestFocusInPopUpWindow(); } private void addKeyBindingToRequestFocusInPopUpWindow() { textField.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, true), "Down released"); textField.getActionMap().put("Down released", new AbstractAction() { @Override public void actionPerformed(ActionEvent ae) {//focuses the first label on popwindow for (int i = 0; i < suggestionsPanel.getComponentCount(); i++) { if (suggestionsPanel.getComponent(i) instanceof SuggestionLabel) { ((SuggestionLabel) suggestionsPanel.getComponent(i)).setFocused(true); autoSuggestionPopUpWindow.toFront(); autoSuggestionPopUpWindow.requestFocusInWindow(); suggestionsPanel.requestFocusInWindow(); suggestionsPanel.getComponent(i).requestFocusInWindow(); break; } } } }); suggestionsPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, true), "Down released"); suggestionsPanel.getActionMap().put("Down released", new AbstractAction() { int lastFocusableIndex = 0; @Override public void actionPerformed(ActionEvent ae) {//allows scrolling of labels in pop window (I know very hacky for now :)) ArrayList<SuggestionLabel> sls = getAddedSuggestionLabels(); int max = sls.size(); if (max > 1) {//more than 1 suggestion for (int i = 0; i < max; i++) { SuggestionLabel sl = sls.get(i); if (sl.isFocused()) { if (lastFocusableIndex == max - 1) { lastFocusableIndex = 0; sl.setFocused(false); autoSuggestionPopUpWindow.setVisible(false); setFocusToTextField(); checkForAndShowSuggestions();//fire method as if document listener change occured and fired it } else { sl.setFocused(false); lastFocusableIndex = i; } } else if (lastFocusableIndex <= i) { if (i < max) { sl.setFocused(true); autoSuggestionPopUpWindow.toFront(); autoSuggestionPopUpWindow.requestFocusInWindow(); suggestionsPanel.requestFocusInWindow(); suggestionsPanel.getComponent(i).requestFocusInWindow(); lastFocusableIndex = i; break; } } } } else {//only a single suggestion was given autoSuggestionPopUpWindow.setVisible(false); setFocusToTextField(); checkForAndShowSuggestions();//fire method as if document listener change occured and fired it } } }); } private void setFocusToTextField() { container.toFront(); container.requestFocusInWindow(); textField.requestFocusInWindow(); } public ArrayList<SuggestionLabel> getAddedSuggestionLabels() { ArrayList<SuggestionLabel> sls = new ArrayList<>(); for (int i = 0; i < suggestionsPanel.getComponentCount(); i++) { if (suggestionsPanel.getComponent(i) instanceof SuggestionLabel) { SuggestionLabel sl = (SuggestionLabel) suggestionsPanel.getComponent(i); sls.add(sl); } } return sls; } private void checkForAndShowSuggestions() { typedWord = getCurrentlyTypedWord(); suggestionsPanel.removeAll();//remove previos words/jlabels that were added //used to calcualte size of JWindow as new Jlabels are added tW = 0; tH = 0; boolean added = wordTyped(typedWord); if (!added) { if (autoSuggestionPopUpWindow.isVisible()) { autoSuggestionPopUpWindow.setVisible(false); } } else { showPopUpWindow(); setFocusToTextField(); } } protected void addWordToSuggestions(String word) { SuggestionLabel suggestionLabel = new SuggestionLabel(word, suggestionFocusedColor, suggestionsTextColor, this); calculatePopUpWindowSize(suggestionLabel); suggestionsPanel.add(suggestionLabel); } public String getCurrentlyTypedWord() {//get newest word after last white spaceif any or the first word if no white spaces String text = textField.getText(); String wordBeingTyped = ""; if (text.contains(" ")) { int tmp = text.lastIndexOf(" "); if (tmp >= currentIndexOfSpace) { currentIndexOfSpace = tmp; wordBeingTyped = text.substring(text.lastIndexOf(" ")); } } else { wordBeingTyped = text; } return wordBeingTyped.trim(); } private void calculatePopUpWindowSize(JLabel label) { //so we can size the JWindow correctly if (tW < label.getPreferredSize().width) { tW = label.getPreferredSize().width; } tH += label.getPreferredSize().height; } private void showPopUpWindow() { autoSuggestionPopUpWindow.getContentPane().add(suggestionsPanel); autoSuggestionPopUpWindow.setMinimumSize(new Dimension(textField.getWidth(), 30)); autoSuggestionPopUpWindow.setSize(tW, tH); autoSuggestionPopUpWindow.setVisible(true); int windowX = 0; int windowY = 0; windowX = container.getX() + textField.getX() + 5; if (suggestionsPanel.getHeight() > autoSuggestionPopUpWindow.getMinimumSize().height) { windowY = container.getY() + textField.getY() + textField.getHeight() + autoSuggestionPopUpWindow.getMinimumSize().height; } else { windowY = container.getY() + textField.getY() + textField.getHeight() + autoSuggestionPopUpWindow.getHeight(); } autoSuggestionPopUpWindow.setLocation(windowX, windowY); autoSuggestionPopUpWindow.setMinimumSize(new Dimension(textField.getWidth(), 30)); autoSuggestionPopUpWindow.revalidate(); autoSuggestionPopUpWindow.repaint(); } public void setDictionary(ArrayList<String> words) { dictionary.clear(); if (words == null) { return;//so we can call constructor with null value for dictionary without exception thrown } for (String word : words) { dictionary.add(word); } } public JWindow getAutoSuggestionPopUpWindow() { return autoSuggestionPopUpWindow; } public Window getContainer() { return container; } public JTextField getTextField() { return textField; } public void addToDictionary(String word) { dictionary.add(word); } boolean wordTyped(String typedWord) { if (typedWord.isEmpty()) { return false; } //System.out.println("Typed word: " + typedWord); boolean suggestionAdded = false; for (String word : dictionary) {//get words in the dictionary which we added boolean fullymatches = true; for (int i = 0; i < typedWord.length(); i++) {//each string in the word if (!typedWord.toLowerCase().startsWith(String.valueOf(word.toLowerCase().charAt(i)), i)) {//check for match fullymatches = false; break; } } if (fullymatches) { addWordToSuggestions(word); suggestionAdded = true; } } return suggestionAdded; }}class SuggestionLabel extends JLabel { private boolean focused = false; private final JWindow autoSuggestionsPopUpWindow; private final JTextField textField; private final AutoSuggestor autoSuggestor; private Color suggestionsTextColor, suggestionBorderColor; public SuggestionLabel(String string, final Color borderColor, Color suggestionsTextColor, AutoSuggestor autoSuggestor) { super(string); this.suggestionsTextColor = suggestionsTextColor; this.autoSuggestor = autoSuggestor; this.textField = autoSuggestor.getTextField(); this.suggestionBorderColor = borderColor; this.autoSuggestionsPopUpWindow = autoSuggestor.getAutoSuggestionPopUpWindow(); initComponent(); } private void initComponent() { setFocusable(true); setForeground(suggestionsTextColor); addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent me) { super.mouseClicked(me); replaceWithSuggestedText(); autoSuggestionsPopUpWindow.setVisible(false); } }); getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true), "Enter released"); getActionMap().put("Enter released", new AbstractAction() { @Override public void actionPerformed(ActionEvent ae) { replaceWithSuggestedText(); autoSuggestionsPopUpWindow.setVisible(false); } }); } public void setFocused(boolean focused) { if (focused) { setBorder(new LineBorder(suggestionBorderColor)); } else { setBorder(null); } repaint(); this.focused = focused; } public boolean isFocused() { return focused; } private void replaceWithSuggestedText() { String suggestedWord = getText(); String text = textField.getText(); String typedWord = autoSuggestor.getCurrentlyTypedWord(); String t = text.substring(0, text.lastIndexOf(typedWord)); String tmp = t + text.substring(text.lastIndexOf(typedWord)).replace(typedWord, suggestedWord); textField.setText(tmp + " "); }}就目前而言，IMO唯一可能需要添加的内容是：
UP
弹出自动提示框中的项目的关键焦点可遍历性，因此我们可以向上移动。
如果有任何纠结，我会知道我能做什么。但是似乎运行良好。
