按Enter键切换JTextFields

我创建了多个文本字段，我想知道如何通过按Enter键在字段之间切换焦点。

另外，我可以控制目标字段吗？ 例如，我可以通过按field A的Enter来定义焦点将更改为field C吗？

Answer 1

简单的例子：

假设您有两个JTextField ： textField和textField1

 textField.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { textField1.requestFocusInWindow(); } }); textField1.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { textField.requestFocusInWindow(); } }); 

现在，当你专注于第一个JTextField时按Enter ，另一个将聚焦，反之亦然。

Answer 2

看看如何使用焦点子系统

它将说明如何设置焦点子系统的传输键

简单的例子

 public class TestFocusTransfersal { public static void main(String[] args) { new TestFocusTransfersal(); } public TestFocusTransfersal() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private JTextField field1 = new JTextField("1", 10); private JTextField field2 = new JTextField("2", 10); private JTextField field3 = new JTextField("3", 10); private JTextField field4 = new JTextField("4", 10); private JTextField field5 = new JTextField("5", 10); private JTextField field6 = new JTextField("6", 10); private JTextField field7 = new JTextField("7", 10); private JTextField field8 = new JTextField("8", 10); private JTextField field9 = new JTextField("9", 10); private final MyOwnFocusTraversalPolicy policy; public TestPane() { // Set up enter for focus transfer... Set forwardKeys = getFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS); Set newForwardKeys = new HashSet(forwardKeys); newForwardKeys.add(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0)); setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, newForwardKeys); setLayout(new GridBagLayout()); add("Field #1: ", field1, 0, 0); add("Field #2: ", field2, 2, 0); add("Field #3: ", field3, 4, 0); add("Field #4: ", field4, 6, 0); add("Field #5: ", field5, 8, 0); add("Field #6: ", field6, 2, 1); add("Field #7: ", field7, 4, 1); add("Field #8: ", field8, 6, 1); add("Field #9: ", field9, 8, 1); policy = new MyOwnFocusTraversalPolicy( field1, field6, field7, field8, field9, field2, field3, field4, field5 ); // You can do this to make life easier, but it may have unexpected // consequences... // setFocusCycleRoot(true); // setFocusTraversalPolicy(policy); } @Override public void addNotify() { super.addNotify(); // Comment this out if you use focusCycleRoot SwingUtilities.getWindowAncestor(this).setFocusTraversalPolicy(policy); } protected void add(String label, JTextField field, int x, int y) { GridBagConstraints gbc = new GridBagConstraints(); gbc.gridy = y; gbc.gridx = x; gbc.insets = new Insets(2, 2, 2, 2); gbc.anchor = GridBagConstraints.EAST; add(new JLabel(label), gbc); gbc.gridx++; add(field, gbc); } } public static class MyOwnFocusTraversalPolicy extends FocusTraversalPolicy { private List order; public MyOwnFocusTraversalPolicy(Component... order) { this.order = new ArrayList<>(Arrays.asList(order)); } @Override public Component getComponentAfter(Container focusCycleRoot, Component aComponent) { int idx = (order.indexOf(aComponent) + 1) % order.size(); return order.get(idx); } @Override public Component getComponentBefore(Container focusCycleRoot, Component aComponent) { int idx = order.indexOf(aComponent) - 1; if (idx < 0) { idx = order.size() - 1; } return order.get(idx); } @Override public Component getDefaultComponent(Container focusCycleRoot) { return order.get(0); } @Override public Component getLastComponent(Container focusCycleRoot) { return order.size() > 0 ? order.get(order.size()) : null; } @Override public Component getFirstComponent(Container focusCycleRoot) { return order.get(0); } } }