Java登录窗口

package b;

import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Label;
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.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class Main extends JFrame implements ActionListener {

	public JLabel labelUsername() {
		JLabel labelUsername = new JLabel("输入用户名", SwingUtilities.RIGHT);
		labelUsername.setFont(new Font("微软雅黑", Font.BOLD, 50));
		return labelUsername;
	}

	public JTextField jtfUsername() {
		JTextField jtfUsername = new JTextField(10);
		jtfUsername.setFont(new Font("微软雅黑", Font.BOLD, 50));
		return jtfUsername;
	}

	public JLabel labelPassword() {
		JLabel labelPassword = new JLabel("输入密码", SwingUtilities.RIGHT);
		labelPassword.setFont(new Font("微软雅黑", Font.BOLD, 50));
		return labelPassword;
	}

	public JPasswordField jpfPassword() {
		JPasswordField jpfPassword = new JPasswordField();
		jpfPassword.setFont(new Font("微软雅黑", Font.BOLD, 50));
		return jpfPassword;
	}

	public JButton jbLogin() {
		JButton jbLogin = new JButton("登录");
		jbLogin.setFont(new Font("微软雅黑", Font.BOLD, 50));
		jbLogin.addActionListener(this);
		return jbLogin;
	}

	public JButton jbReg() {
		JButton jbReg = new JButton("注册");
		jbReg.setFont(new Font("微软雅黑", Font.BOLD, 50));
		jbReg.addActionListener(this);
		return jbReg;
	}

	public Main() {
		this.setLayout(new GridLayout(3, 2));
		this.add(this.labelUsername());
		this.add(this.jtfUsername());
		this.add(this.labelPassword());
		this.add(this.jpfPassword());
		this.add(this.jbLogin());
		this.add(this.jbReg());

	}

	public static void main(String[] args) {
		Main m = new Main();
		m.setBounds(0, 0, 640, 480);
		// m.setExtendedState(JFrame.MAXIMIZED_BOTH);
		m.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		m.setVisible(true);

	}

	public void actionPerformed(ActionEvent ae) {
		String s = ae.getActionCommand();
		if (s.equals("登录")) {
			System.out.println(s);
		} else if (s.equals("注册")) {
			System.out.println(s);
		}
	}

}