qq注册界面

我要达到像http://bbs.bc-cn.net/showimgpage.asp?BoardID=8&filename=2007-8/2007826030161949.jpg中的样子，可总是有问题。我用的是网格包。我也不知道那里出问题了。怪怪的，希望有经验的兄弟帮忙看下。顺便告诉我些知识那更好。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Register
{
    private JPanel panel;
    private GridBagConstraints gc;
    private JTextField userNumber;
    private JTextField userNikeName;
    private JTextField password;
    private JTextField name;
    private JTextField age;
    public Register()
    {
        userNumber=new JTextField(15);
        userNikeName=new JTextField(20);
        password=new JTextField(20);
        name=new JTextField(10);
        age=new JTextField(8);
        JFrame frame1=new JFrame("J-QQ用户注册");
        frame1.show(true);
        panel=new JPanel(new GridBagLayout());
        gc=new GridBagConstraints();        gc.fill=GridBagConstraints.VERTICAL;
        addComponent(new JLabel("用户号码:"),0,0,3,1);
        
        gc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(userNumber,0,1,4,1);
        
        gc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(new JLabel("用户昵称:"),2,0,3,1);
        
        gc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(userNikeName,2,1,4,1);
        
        gc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(new JLabel("用户口令:"),4,0,3,1);
        
        gc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(password,4,1,4,1);
        
        gc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(new JLabel("姓名:"),6,0,2,1);
        
        gc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(name,6,1,3,1);
        
        gc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(new JLabel("年龄:"),6,2,2,1);
        
         gc.fill=GridBagConstraints.HORIZONTAL;
         addComponent(age,6,3,2,1);
         
        frame1.setSize(415,500);
        frame1.add(panel);
    }
    
    
    public void addComponent(Component c,int row,int col,int nrow,int ncol)
    {
        
        gc.gridx = col;
        gc.gridy = row;
        
        gc.gridwidth = ncol;
        gc.gridheight = nrow;
       
        panel.add(c,gc); 
           
    }
    public static void main(String[] args)
    {
        Register register=new Register();
        
    }}[upload=jpg]UploadFile/2007-8/2007826030161949.jpg[/upload]