PasswordDemo

博客上的文章太少了，所以把这个也贴到这了。大家扔砖头吧。
java 代码

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

public class PasswordDemo{
    // 口令和文本输入域
    JPasswordField passwordField = new JPasswordField(12);
    JTextField textField = new JTextField(12);

    public static void main(String[] args){
        PasswordDemo pd = new PasswordDemo();
        pd.go();
    }

    void go(){
        // 设置口令回显字符为X
        passwordField.setEchoChar('X');
        // 创建各个标签、按钮
        final JFrame f = new JFrame("PasswordDemo");
        JLabel label1 = new JLabel("输入用户名: ");
        JLabel label2 = new JLabel("输入口令");
        JButton button1 = new JButton("确定");
        JButton button2 = new JButton("取消");

        // 鼠标单击“OK”按钮则执行这段代码
        button1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                // 获取输入的名字
                String name = textField.getText();
                // 获取输入的口令值
                char[] password = passwordField.getPassword();
                System.out.println("输入用户名: " + name);
                System.out.println("输入口令: "+ new String(password));
            }
        });

        // 使用网络布局
        JPanel contentPane = new JPanel(new GridLayout(3,2));
        contentPane.add(label1);
        contentPane.add(textField);
        contentPane.add(label2);
        contentPane.add(passwordField);
        contentPane.add(button1);
        contentPane.add(button2);
        f.setContentPane(contentPane);

        // 关闭窗口
        f.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);
            }
        });
        f.pack();
        f.setVisible(true);
    }
}