Java - 密碼字段字符計數器

Question

我有一個任務需要我創建一個JPasswordField。需要兩個按鈕，一個用於在另一個文本框中顯示實際密碼，另一個僅顯示文本框中的字符數。這是我的目標，但我無法編譯它，因爲Method setText in class javax.swing.text.JTextComponent cannot be applied to given types. 編譯器在bt1下停止，當我希望它自己讀取密碼時。

任何人都可以幫忙嗎？

謝謝。 代碼：

public class JavaPasswordCount { 
    public JavaPasswordCount() { 
     JFrame window = new JFrame("Password Character Count"); 
     window.setSize(50, 50); 
     JButton bt1 = new JButton("Show Count"); 
     JButton bt2 = new JButton("Show Password"); 
     final JPasswordField pwd = new JPasswordField(); 
     final JTextField tf = new JTextField(); 
     final int counter; 

     JPanel panel = new JPanel(); 

     bt1.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) { 
       tf.setText(pwd.getPassword()); 
      } 
     }); 

     bt2.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) { 
       counter = pwd.length(); 
       tf.setText(counter); 
      } 
     }); 

     panel.setLayout(new FlowLayout()); // Add buttons and TextField to the panel 
     panel.add(tf); 
     panel.add(pwd); 
     panel.add(bt1); 
     panel.add(bt2); 

     window.getContentPane().add(panel, BorderLayout.CENTER); 
     window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     window.pack(); 
     window.setVisible(true); 
    } 
    public static void main(String[] args) { 
     try { 
      UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName()); 
     } catch (Exception e) { 
     } 

     JavaPasswordCount application = new JavaPasswordCount(); 
    } 
} 

Answer 1

更改此行：

counter = pwd.length(); 
tf.setText(counter); 

到

int counter = pwd.getPassword().length; 
tf.setText(String.valueOf((counter))); 

這

tf.setText(pwd.getPassword()); 

要

tf.setText(pwd.getPassword().toString());