晚上好，我在运行进度条时遇到问题，请检查我的代码并告诉我问题出在哪里：
/**
** @author Islam */
public class Register extends javax.swing.JFrame implements Runnable {
static final int MY_MINIMUM = 0;
static final int MY_MAXIMUM = 100;
private Pattern pattern;
private Matcher matcher;
private static final String EMAIL_PATTERN =
"^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
+ "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
boolean isValidPassord = true;
Thread th;
public Register() {
initComponents();
passwordTextF.addKeyListener(new passwordListener());
passwordMeter = new JProgressBar();
passwordMeter.setMinimum(MY_MINIMUM);
passwordMeter.setMaximum(MY_MAXIMUM);
th = new Thread(this);
th.start();
}
public void updateBar(int newValue) {
passwordMeter.setValue(newValue);
passwordMeter.setStringPainted(true);
System.out.println(newValue);
}
public void run() {
for (int i = MY_MINIMUM; i <= MY_MAXIMUM; i++) {
updateBar(i);
try {
Thread.sleep(100);
} catch (InterruptedException ex) {
Logger.getLogger(Register.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
class passwordListener implements KeyListener {
public void keyPressed(KeyEvent e) {
passwordLabel.setForeground(Color.BLACK);
}
public void keyReleased(KeyEvent e) {
// Register.this.validatePassword(passwordTextF.getText());
if (!isValidPassord) {
// new PasswordMeterHandler().start();
}
}
public void keyTyped(KeyEvent e) {
}
}
public boolean validateEmail(String mailFromForm) {
pattern = Pattern.compile(EMAIL_PATTERN);
matcher = pattern.matcher(mailFromForm);
return matcher.matches();
}
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
int i = 0;
this.validateEmail(nameTextF.getText());
this.validatePassword(passwordTextF.getText());
if (!matcher.matches()) {
EMailLabel.setForeground(Color.red);
}
if (!isValidPassord) {
passwordLabel.setForeground(Color.red);
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
}
public static void main(String args[]) {
/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
Register frame = new Register();
frame.setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel EMailLabel;
private javax.swing.JTextField EMailTextF;
private javax.swing.ButtonGroup buttonGroup1;
private javax.swing.ButtonGroup buttonGroup2;
private javax.swing.JComboBox countryCombo;
private javax.swing.JComboBox genderCombo;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel nameLabel;
private javax.swing.JTextField nameTextF;
private javax.swing.JLabel passwordLabel;
private javax.swing.JProgressBar passwordMeter;
private javax.swing.JPasswordField passwordTextF;
private javax.swing.JLabel strengthLabel;
private javax.swing.JLabel userNameLabel;
private javax.swing.JTextField userNameTextF;
// End of variables declaration
}
答案 0 :(得分：0)
将JProgressBar添加到JFrame，调用setVisible，在构造函数之外启动线程（对于线程的过早结束）。
public class Register extends JFrame {
static final int MY_MINIMUM = 0;
static final int MY_MAXIMUM = 100;
private JProgressBar passwordMeter;
public Register() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
setBounds(50, 50, 640, 100);
passwordMeter = new JProgressBar();
passwordMeter.setMinimum(MY_MINIMUM);
passwordMeter.setMaximum(MY_MAXIMUM);
add(passwordMeter, BorderLayout.CENTER);
}
public void start() {
new PasswordMeterHandler().start();
}
class PasswordMeterHandler extends Thread {
public void updateBar(final int newValue) {
EventQueue.invokeLater(new Runnable() {
public void run() {
passwordMeter.setValue(newValue);
passwordMeter.setStringPainted(true);
}
});
//passwordMeter.setValue(newValue);
//passwordMeter.setStringPainted(true);
System.out.println(newValue);
}
@Override
public void run() {
for (int i = MY_MINIMUM; i <= MY_MAXIMUM; i++) {
updateBar(i);
try {
Thread.sleep(100);
} catch (InterruptedException ex) {
Logger.getLogger(Register.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
public void run() {
Register frame = new Register();
frame.setVisible(true);
frame.start();
}
});
}
}
答案 1 :(得分：0)
让我们从以下事实开始：在您的示例中，进度条永远不会添加到任何内容，然后转移到违反最重要的Swing规则之一 - 永远不要创建或修改任何UI元素事件派遣线程。
KeyListener不是跟踪文字组件更改的合适方法，如果用户将文字粘贴到字段中，则不会考虑这些方法。
如果您要更改进入该字段的内容，则应使用DocumentListener来监控对基础文档的更改，并使用DocumentFilter ...
public class TestPasswordField {
public static void main(String[] args) {
new TestPasswordField();
}
public TestPasswordField() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
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 JPasswordField password;
private JProgressBar progressBar;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
password = new JPasswordField(10);
progressBar = new JProgressBar(0, 10);
password.getDocument().addDocumentListener(new DocumentListener() {
protected void updateProgress() {
progressBar.setValue(password.getPassword().length);
}
@Override
public void insertUpdate(DocumentEvent e) {
updateProgress();
}
@Override
public void removeUpdate(DocumentEvent e) {
updateProgress();
}
@Override
public void changedUpdate(DocumentEvent e) {
updateProgress();
}
});
add(password, gbc);
gbc.gridy++;
add(progressBar, gbc);
}
}
}