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POJPasswordField focus issue
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copied!<p>I wrote a very simple logon JPanel following the demo in <a href="http://download.oracle.com/javase/tutorial/uiswing/components/passwordfield.html" rel="nofollow">http://download.oracle.com/javase/tutorial/uiswing/components/passwordfield.html</a></p> <p>it has three components, </p> <ol> <li>JTextField to get username</li> <li>JPasswordField to get password</li> <li>JButton to logon</li> </ol> <p>then the JPanel is shown in the JFrame when the application starts. the issue is, I found if I click on password field first, i can enter password without problem. however if I enter username first then I can't enter anything in the password field. anyone knows what might be going wrong here? </p> <p>here is the the code I wrote for the logon panel, this code can be compiled and run, but the password can't be entered. is there something I missed?</p> <pre><code>import javax.swing.*; import javax.swing.border.*; import java.awt.*; import java.awt.event.*; import java.util.Arrays; public class Logon extends javax.swing.JPanel implements ActionListener { private JTextField fldName; private JPasswordField fldPasswd; private JButton btnLogon; public Logon() { JLabel labTitle = new JLabel("title"); labTitle.setText("EMT Monitor v.1.0"); // username fldName = new JTextField(10); JLabel labName = new JLabel("Username"); labName.setText("Username:"); labName.setLabelFor(fldPasswd); // passwd fldPasswd = new JPasswordField(10); fldPasswd.setActionCommand("Logon"); fldPasswd.addActionListener(this); fldPasswd.requestFocusInWindow(); JLabel labPasswd = new JLabel("Password"); labPasswd.setText("Password:"); labPasswd.setLabelFor(fldPasswd); // botten btnLogon = new JButton("Logon"); btnLogon.setActionCommand("Logon"); btnLogon.addActionListener(this); JPanel mainPanel = new JPanel(); btnLogon.setPreferredSize(new Dimension(200, 30)); mainPanel.setPreferredSize(new Dimension(340, 190)); mainPanel.add(labName); mainPanel.add(fldName); mainPanel.add(labPasswd); mainPanel.add(fldPasswd); mainPanel.add(btnLogon); JPanel outPanel = new JPanel(); outPanel.setPreferredSize(new Dimension(400, 300)); outPanel.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED)); outPanel.add(mainPanel); add(outPanel); setAlignmentX(Component.CENTER_ALIGNMENT); setAlignmentY(Component.CENTER_ALIGNMENT); setVisible(true); } public void actionPerformed(ActionEvent e) { String cmd = e.getActionCommand(); if (cmd.equals("Logon")) { //Process the password. String user = fldName.getText(); String passwd = new String(fldPasswd.getPassword()); System.out.println(user + " " + passwd); } } private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("Logon"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. final Logon newContentPane = new Logon(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event dispatch thread: //creating and showing this application's GUI. SwingUtilities.invokeLater(new Runnable() { public void run() { //Turn off metal's use of bold fonts UIManager.put("swing.boldMetal", Boolean.FALSE); createAndShowGUI(); } }); } } </code></pre>

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