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    <p>First you want to have a text field without focus cycling, and tab suppression:</p> <pre><code>jTextField1.setFocusCycleRoot(true); jTextField1.setFocusTraversalKeysEnabled(false); </code></pre> <p>Then a data model for the files (here local directory, but SSH is likewise):</p> <pre><code>private File dir = new File("C:/Work"); private String typedPrefix = null; private List&lt;String&gt; filesWithPrefix = new ArrayList&lt;&gt;(); </code></pre> <p>Then a key pressed handling for the TAB:</p> <ul> <li>Consume the event.</li> <li>Get the prefix upto the caret for searching file names.</li> <li>If you merely need to restrict already found file names, so do, otherwise physical search them.</li> <li><p>Look for the longest common prefix in the file names. Display that.</p> <pre><code>private void jTextField1KeyPressed(java.awt.event.KeyEvent evt) { System.out.println("KeyPressed " + evt); if (evt.getKeyCode() == KeyEvent.VK_TAB) { evt.consume(); int caretPos = jTextField1.getCaretPosition(); try { final String newPrefix = jTextField1.getText(0, caretPos); System.out.println("newPrefix: " + newPrefix); if (!newPrefix.isEmpty()) { if (typedPrefix == null || !newPrefix.startsWith(typedPrefix)) { // Must physically reload possible values: String[] fileNames = dir.list(new FilenameFilter() { @Override public boolean accept(File dir, String name) { return name.startsWith(newPrefix); } }); filesWithPrefix.clear(); Collections.addAll(filesWithPrefix, fileNames); typedPrefix = newPrefix; } else { // Can reduce prior selection: for (ListIterator&lt;String&gt; it = filesWithPrefix.listIterator(); it.hasNext(); ) { String fileName = it.next(); if (!fileName.startsWith(newPrefix)) { it.remove(); } } typedPrefix = newPrefix; } System.out.println("filesWithPrefix: " +filesWithPrefix); if (!filesWithPrefix.isEmpty()) { // Find longest common prefix: String longestCommonPrefix = null; for (String fileName : filesWithPrefix) { if (longestCommonPrefix == null) { longestCommonPrefix = fileName; } else { while (!fileName.startsWith(longestCommonPrefix)) { longestCommonPrefix = longestCommonPrefix.substring(0, longestCommonPrefix.length() - 1); } } } if (longestCommonPrefix.length() &gt; typedPrefix.length()) { jTextField1.setText(longestCommonPrefix); jTextField1.setCaretPosition(longestCommonPrefix.length()); typedPrefix = longestCommonPrefix; } if (filesWithPrefix.size() &gt; 1) { // Show popup: ;;; } else if (filesWithPrefix.size() == 1) { // File selected: System.beep(); } } } } catch (BadLocationException ex) { Logger.getLogger(TabsJFrame.class.getName()).log(Level.SEVERE, null, ex); } } } </code></pre></li> </ul> <p>What is missing is the display of the ambiguous file names. Popup menu would be nice, wouldn't it?</p> <p>Popup:</p> <pre><code> // Show popup: JPopupMenu popup = new JPopupMenu(); for (String fileName : filesWithPrefix) { popup.add(new AbstractAction(fileName) { @Override public void actionPerformed(ActionEvent e) { jTextField1.setText(e.getActionCommand()); } }); } Point pt = jTextField1.getCaret().getMagicCaretPosition(); popup.show(jTextField1, pt.x, pt.y + 5); </code></pre>
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    1. POWindows application with Auto-complete using tab of unix machine files and directories
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    1. USJoop Eggen
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    1. COThank you very much for your detailed answer.
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      1. USSharonBL
    2. COI used your code + grab files from my Unix machine. Worked amazingly! Now I want to create a popup menu. How should I do it? JTextField can have popup?
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    3. COExtended the popup code. Placed it a bit lower (+5) than the top of the text field.
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