JAVA中JPasswordField实现密码的确认

在Java中，可以使用JPasswordField来实现密码的确认。以下是一个简单的实现示例：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class PasswordConfirmation extends JFrame implements ActionListener {
    private JPasswordField passwordField1, passwordField2;
    private JButton confirmButton;

    public PasswordConfirmation() {
        setTitle("Password Confirmation");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 150);
        setLocationRelativeTo(null);

        passwordField1 = new JPasswordField();
        passwordField2 = new JPasswordField();
        confirmButton = new JButton("Confirm");
        confirmButton.addActionListener(this);

        JPanel panel = new JPanel(new GridLayout(3, 2));
        panel.add(new JLabel("Password:"));
        panel.add(passwordField1);
        panel.add(new JLabel("Confirm Password:"));
        panel.add(passwordField2);
        panel.add(new JLabel());
        panel.add(confirmButton);

        add(panel);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == confirmButton) {
            char[] password1 = passwordField1.getPassword();
            char[] password2 = passwordField2.getPassword();

            if (password1.length == 0 || password2.length == 0) {
                JOptionPane.showMessageDialog(this, "Please enter password and confirm password.");
            } else if (password1.length != password2.length) {
                JOptionPane.showMessageDialog(this, "Password and confirm password don't match.");
            } else {
                boolean match = true;
                for (int i = 0; i < password1.length; i++) {
                    if (password1[i] != password2[i]) {
                        match = false;
                        break;
                    }
                }
                if (match) {
                    JOptionPane.showMessageDialog(this, "Password confirmed.");
                } else {
                    JOptionPane.showMessageDialog(this, "Password and confirm password don't match.");
                }
            }
        }
    }

    public static void main(String[] args) {
        new PasswordConfirmation();
    }
}

在这个示例中，我们创建了两个JPasswordField来输入密码和确认密码，以及一个JButton来执行确认操作。当用户点击确认按钮时，我们将获取两个JPasswordField中的密码，然后进行比较。如果两个密码不一致，则会弹出一个对话框提示用户密码不匹配。如果两个密码一致，则会弹出一个对话框提示用户密码确认成功。