源代码：

package 幸运抽奖;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class DengLuPanel {
	JFrame jf;
	JButton zhuCeButton;
	JTextField idTextField;
	JPasswordField passwordTextField;
	JPanel idPanel, passwordPanel, buttonPanel;
	JLabel idLabel, passwordLabel;
	static int i = 0;

	public static void main(String[] args) {
		DengLuPanel dlp = new DengLuPanel();
		dlp.login();

	}

	public void login() {
		jf = new JFrame();
		jf.setSize(300, 200);
		jf.setLocation(300, 300);
		jf.setLayout(new BorderLayout());

		// 账号面板及相关组件
		idPanel = new JPanel();
		idLabel = new JLabel("账号：");
		idTextField = new JTextField(20);
		idPanel.add(idLabel);
		idPanel.add(idTextField);
		jf.add(idPanel, BorderLayout.NORTH);

		// 密码面板及相关组件
		passwordPanel = new JPanel();
		passwordLabel = new JLabel("密码：");
		passwordTextField = new JPasswordField(20);
		passwordPanel.add(passwordLabel);
		passwordPanel.add(passwordTextField);
		jf.add(passwordPanel, BorderLayout.CENTER);

		// 按钮面板及相关组件
		buttonPanel = new JPanel();
		zhuCeButton = new JButton("注册");
		buttonPanel.add(zhuCeButton);
		jf.add(buttonPanel, BorderLayout.SOUTH);

		zhuCeButton.addActionListener(new ActionListener() {

			@SuppressWarnings("unused")
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO 自动生成的方法存根
				if (idTextField.getText().equals("abc") && passwordTextField.getText().equals("123")) {
					JOptionPane.showConfirmDialog(null, "登录成功");
				} else {
					if (i == 2) {
						System.exit(0);
					} else {
						i++;
						JOptionPane.showMessageDialog(null, "登陆失败,你还有" + (3 - i) + "次机会");
					}
				}
			}

		});

		jf.setVisible(true);
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}