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国籍的java代码怎么写 国籍怎么填 china chinese

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java 编写用户注册页面，包含用户名、密码、性别、兴趣爱好、籍贯（下拉列表实现）、邮件地址等信只是参考国籍的java代码怎么写，需要自己需改国籍的java代码怎么写！
package com.ivory.view;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import com.ivory.common.User;
import com.ivory.sql.UserServer;
public class AddUser extends JDialog implements ActionListener
{
JLabel jl1,jl2,jl3,jl4,jl5,jl6,jl7,jl8,jl9;
JTextField jtf1,jtf2,jtf3,jtf4,jtf5,jtf6,jtf7,jtf8;
JButton jb1,jb2;
Font f1=new Font("宋体",Font.PLAIN,16);
User user;
public AddUser(User u)
{
Container ct=new Container();
jl1=new JLabel("账号");
jl1.setFont(f1);
jl1.setBounds(10, 60, 100, 30);
jl2=new JLabel("密码");
jl2.setFont(f1);
jl2.setBounds(10, 110, 100, 30);
jl3=new JLabel("密码");
jl3.setFont(f1);
jl3.setBounds(10, 160, 100, 30);
jl4=new JLabel("姓名");
jl4.setFont(f1);
jl4.setBounds(10, 210, 100, 30);
jl5=new JLabel("性别");
jl5.setFont(f1);
jl5.setBounds(10, 260, 100, 30);
jl6=new JLabel("班级");
jl6.setFont(f1);
jl6.setBounds(10, 310, 100, 30);
jl7=new JLabel("Tel");
jl7.setFont(f1);
jl7.setBounds(10, 370, 100, 30);
jl8=new JLabel("成绩");
jl8.setFont(f1);
jl8.setBounds(10, 410, 100, 30);
jl9=new JLabel("注册用户");
jl9.setFont(f1);
jl9.setBounds(100, 10, 100, 30);
jb1=new JButton(new ImageIcon("image\\queding.jpg"));
jb1.setBounds(40, 460, 70, 30);
jb1.addActionListener(this);
jb1.setActionCommand("queding");
jb2=new JButton(new ImageIcon("image\\quxiao.jpg"));
jb2.setBounds(200, 460, 70, 30);
jb2.addActionListener(this);
jb2.setActionCommand("quxiao");
jtf1=new JTextField(20);
jtf1.setBounds(50, 60, 200, 30);
jtf2=new JTextField(20);
jtf2.setBounds(50, 110, 200, 30);
jtf3=new JTextField(10);
jtf3.setBounds(50, 160, 200, 30);
jtf4=new JTextField(20);
jtf4.setBounds(50, 210, 200, 30);
jtf5=new JTextField(15);
jtf5.setBounds(50, 260, 200, 30);
jtf6=new JTextField(20);
jtf6.setBounds(50, 310, 200, 30);
jtf7=new JTextField(10);
jtf7.setBounds(50, 360, 200, 30);
jtf8=new JTextField(20);
jtf8.setBounds(50, 410, 200, 30);
jtf8.setText("100");
jtf8.setEditable(false);
ct.add(jl9);ct.add(jl1);ct.add(jl2);
ct.add(jl3);ct.add(jl4);ct.add(jl5);
ct.add(jl6);ct.add(jl7);ct.add(jl8);
ct.add(jtf1);ct.add(jtf2);ct.add(jtf3);
ct.add(jtf4);ct.add(jtf5);ct.add(jtf6);
ct.add(jtf7);ct.add(jtf8);
ct.add(jb1);ct.add(jb2);
BackIamge bi=new BackIamge();
bi.setBounds(0,0,300,500);
ct.add(bi);
this.add(ct);
this.setSize(300,500);
this.setUndecorated(true);
this.setLocation(500, 100);
this.setVisible(true);
}
//定义一个内部类(背景图片)
class BackIamge extends JPanel
{
Image im;
public BackIamge()
{
try {
im=ImageIO.read(new File("image//add.jpg"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//定义paint方法
public void paintComponent(Graphics g)
{
//画出背景图片
g.drawImage(im, 0,0,300,500,this);
}
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getActionCommand().equals("queding"))
{
User u=new User();
u.setUser(jtf1.getText());
u.setPassword(jtf2.getText());
u.setPassword(jtf3.getText());
u.setNumName(jtf4.getText());

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