How to use

setEchoChar

method

in

javax.swing.JPasswordField

/**
 * Set echo character.
 *
 * @param c
 *            Echo character
 */
public void setEchoChar(char c) {
  jpfPassword.setEchoChar(c);
}

private void makePasswordInvisible() {
 myPasswordField.setEchoChar('•');
}

private void makePasswordVisible() {
 myPasswordField.setEchoChar('\u0000');
}

  @Override
  public void actionPerformed(java.awt.event.ActionEvent e) {    
    if (chkShowPassword.isSelected()) {
      txtProxyChainPassword.setEchoChar((char) 0);
    } else {
      txtProxyChainPassword.setEchoChar('*');
    }
  }
});

  @Override
  public void actionPerformed(java.awt.event.ActionEvent e) {    
    if (chkShowPassword.isSelected()) {
      txtProxyChainPassword.setEchoChar((char) 0);
    } else {
      txtProxyChainPassword.setEchoChar('*');
    }
  }
});

  public void stateChanged(ChangeEvent e)
  {
    tfpass.setEchoChar(cbshowchars.isSelected() ? 0 : echo);
  }
});

  public void stateChanged(ChangeEvent e)
  {
    tfpass.setEchoChar(cbshowchars.isSelected() ? 0 : echo);
  }
});

 JPasswordField password = new JPasswordField(15);
{
 password.setEchoChar('%');
}

 JPasswordField p1=new JPasswordField("pass",6);
p1.setEchoChar('*');
top.add(p1);

 JPasswordField user = new JPasswordField(10);
user.setEchoChar('?');
panel.add(user);

private void showPasswordCheckBoxItemStateChanged(java.awt.event.ItemEvent evt) {//GEN-FIRST:event_showPasswordCheckBoxItemStateChanged
  if (showPasswordCheckBox.isSelected()) {
    passwordPasswordField.setEchoChar((char) 0);
  } else {
    passwordPasswordField.setEchoChar(reference.getEchoChar());
  }
}//GEN-LAST:event_showPasswordCheckBoxItemStateChanged

@Override
public void actionPerformed(ActionEvent e) {
 JButton button = (JButton) e.getSource();
 if (asClearText) {
  ButtonDecorator.applyShow(button);
 } else {
  ButtonDecorator.applyHide(button);
 }
 asClearText = !asClearText;
 if (asClearText) {
  // Reveal
  password1.setEchoChar('\0');
  password2.setEchoChar('\0');
 } else {
  // Use the platform choice
  password1.setEchoChar(echoChar);
  password2.setEchoChar(echoChar);
 }
}

@Override
public void setEchoChar(char echoChar) {
  
  getSwingComponent().setEchoChar(echoChar);
}

public JPasswordFieldTutorial() {
  button.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
      char [] input = passwordField.getPassword();
      if(checkIfCorrect(input)) {
        JOptionPane.showMessageDialog(null,"Password is correct!");
      } else {
        JOptionPane.showMessageDialog(null,"Password is incorrect!");
      }
    }
  });
  passwordField.setEchoChar('*');
  panel.add(passwordField);
  panel.add(button);
  frame.add(panel);
  frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
  frame.pack();
  frame.setVisible(true);
}

@Override
public void actionPerformed(ActionEvent e) {
 JButton button = (JButton) e.getSource();
 if (asClearText) {
  ButtonDecorator.applyShow(button);
 } else {
  ButtonDecorator.applyHide(button);
 }
 asClearText = !asClearText;
 if (asClearText) {
  // Reveal
  password.setEchoChar('\0');
 } else {
  // Use the platform choice
  password.setEchoChar(echoChar);
 }
}

private void showButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_showButtonActionPerformed
  if (!passwordVisible) {
    passwordVisible = true;
    originalFont = passwordField.getFont();
    passwordField.setFont(usernameTextField.getFont());
    originalEchoChar = passwordField.getEchoChar();
    passwordField.setEchoChar((char) 0);
    Mnemonics.setLocalizedText(showButton, NbBundle.getMessage(CustomizerGeneral.class, "LBL_ShowButtonHide"));
    showButton.setToolTipText(NbBundle.getMessage(CustomizerGeneral.class, "LBL_ShowButtonHide_ToolTip"));
  } else {
    passwordVisible = false;
    passwordField.setFont(originalFont);
    passwordField.setEchoChar(originalEchoChar);
    Mnemonics.setLocalizedText(showButton, NbBundle.getMessage(CustomizerGeneral.class, "CustomizerGeneral.showButton.text"));
    showButton.setToolTipText(NbBundle.getMessage(CustomizerGeneral.class, "CustomizerGeneral.showButton.toolTipText"));
    
  }
}//GEN-LAST:event_showButtonActionPerformed

final JPasswordField pass = new JPasswordField("Password");
 Font passFont = user.getFont();
 pass.setFont(passFont.deriveFont(Font.ITALIC));
 pass.setForeground(Color.GRAY);
 pass.setPreferredSize(new Dimension(150, 20));
 pass.setEchoChar((char)0);
 pass.addFocusListener(new FocusListener() {
   public void focusGained(FocusEvent e) {
     pass.setEchoChar('*');
     if (pass.getText().equals("Password")) {
       pass.setText("");
     }
   }
   public void focusLost(FocusEvent e) {
     if ("".equalsIgnoreCase(pass.getText().trim())) {
       pass.setEchoChar((char)0);
       pass.setText("Password");
     }
   }});

 private JPasswordField password;
  private String typedPassword;
  private final String defaultPassword = "yourDesiredPassword";

  public void createPasswordField(){

  password = new JPasswordField(30);
  password.setBounds(280, 240, 90, 20);
  password.setEchoChar('*');
  password.setBackground(Color.white);
  password.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent e) {

      password = (JPasswordField) e.getSource();
      char [] tempPass = password.getPassword();
      typedPassword = new String(tempPass);

      if (!typedPassword.equals(defaultPassword)){

        JOptionPane.showMessageDialog(null,
      "Your password is not correct",
      "Stack Over Flow example",
      JOptionPane.ERROR_MESSAGE);
      }
    }
  });
}

@Override
public void initParam(Object obj) {
  
  OptionsParam optionsParam = (OptionsParam) obj;
  ConnectionParam connectionParam = optionsParam.getConnectionParam();
  
  // set Proxy Chain parameters
  txtProxyChainRealm.setText(connectionParam.getProxyChainRealm());
  txtProxyChainRealm.discardAllEdits();
  txtProxyChainUserName.setText(connectionParam.getProxyChainUserName());
  txtProxyChainUserName.discardAllEdits();
  chkShowPassword.setSelected(false);//Default don't show (everytime)
  txtProxyChainPassword.setEchoChar('*');//Default mask (everytime)
  this.proxyDialog.pack();
}

@Override
JPasswordField initSwingComponent() {
  
  TextField textField = getAWTComponent();
  JPasswordField swingComponent = new JPasswordField();
  swingComponent.setText(textField.getText());
  swingComponent.setColumns(textField.getColumns());
  swingComponent.setEchoChar(textField.getEchoChar());
  swingComponent.setEditable(textField.isEditable());
  swingComponent.select(textField.getSelectionStart(),
             textField.getSelectionEnd());
  
  swingComponent.addActionListener(new SwingTextFieldListener());
  return swingComponent;
}