花了点时间写了一个简单的页面：

package test;
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class UserInterface extends JFrame implements WindowListener{
    JFrame jf;
    JPanel jpan1,jpan2,jpan3;
    JLabel username,password,lspace;
    JTextField user,pass;
    JButton login,register;
   
    public void go(){
        
        jf=new JFrame("UserInterface");
        jf.setSize(350, 250);
        jf.setResizable(false);
        jf.setLayout(new GridLayout(6,1,0,5));
        jpan1=new JPanel();
        jpan2=new JPanel();
        jpan3=new JPanel();
        username=new JLabel("Username");
        password=new JLabel("Password");
        user=new JTextField(12);
        pass=new JTextField(12);
        login=new JButton("Login");
        register=new JButton("Register");
        
        jpan1.setSize(200, 50);
        jpan1.add(username);
        jpan1.add(user);
        
        jpan2.setSize(200, 50);
        jpan2.add(password);
        jpan2.add(pass);
        
        jpan3.setLayout(new FlowLayout(FlowLayout.CENTER,20,0));
        jpan3.add(login);
        jpan3.add(register);
        
        lspace=new JLabel();
        jf.add(lspace);
        jf.add(jpan1);
        jf.add(jpan2);
        lspace=new JLabel();
        jf.add(lspace);
        jf.add(jpan3);
        lspace=new JLabel();
        jf.add(lspace);
        
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        jf.setVisible(true);
    }
   
    public static void main(String[] args){
        
        UserInterface ui=new UserInterface();
        ui.go();
    }
   
    public void windowDeactivated(WindowEvent e){
        
    }

    @Override
    public void windowActivated(WindowEvent arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void windowClosed(WindowEvent arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void windowClosing(WindowEvent arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void windowDeiconified(WindowEvent arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void windowIconified(WindowEvent arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void windowOpened(WindowEvent arg0) {
        // TODO Auto-generated method stub
        
    }

}