程序代码：

import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class Test26 {

    public static void main(String[] args) {
        final String userName = "abc";
        final String passwrod = "123";
        JFrame jFrame = new JFrame("登陆界面");
        Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
        jFrame.setBounds(280, 280, 200, 150);
        jFrame.setResizable(false);
        jFrame.setLayout(null);
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JLabel label1 = new JLabel("姓名");
        label1.setBounds(10, 10, 100, 30);
        jFrame.add(label1);
        
        JLabel label2 = new JLabel("密码");
        label2.setBounds(10, 40, 100, 30);
        jFrame.add(label2);
        
        final JTextField text1 = new JTextField();
        text1.setBounds(50, 15, 130, 20);
        jFrame.add(text1);
        
        final JPasswordField text2 = new JPasswordField();
        text2.setBounds(50, 45, 130, 20);
        jFrame.add(text2);
        
        JButton button = new JButton("Login");
        button.setBounds(10, 75, 170, 40);
        button.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {
                if(userName.equals(text1.getText()) && passwrod.equals(text2.getText())) {
                    JOptionPane.showMessageDialog(null, "登陆成功误", "提示", JOptionPane.INFORMATION_MESSAGE);
                } else {
                    JOptionPane.showMessageDialog(null, "错误", "提示", JOptionPane.ERROR_MESSAGE);
                    text1.setText("");
                    text2.setText("");
                }
            }
        });
        jFrame.add(button);
        
        jFrame.setVisible(true);
    }

}