Java로 로그인 창을 구현하는 방법

import java.awt.Container;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
 
public class Test10_3 {
    public static void main(String [] args){
        Denglu de = new Denglu();
    }
}
 
class Denglu{
    private JFrame jf = new JFrame("登陆窗口");
    private JButton jb1 = new JButton("用户名");
    private JButton jb2 = new JButton("密码");
    private JButton jbLogin = new JButton("登陆");
    private JButton jbquxiao = new JButton("取消");
    private JTextField jtName = new JTextField();
    private JTextField jtPwd = new JTextField();
    private final String mima = "sss111";//此为预设的密码
    private int count = 0;
    
    private JFrame jfZhu = new JFrame();
    ImageIcon image = new ImageIcon("C:\\Users\\sss\\Desktop\\index.jpg");//这为我的图片路径
    private JLabel jlZhu = new JLabel(image);
    
    private JFrame jfCuo = new JFrame();
    private JLabel jlCuo = new JLabel("你输入的用户名密码不匹配！");
 
    public Denglu(){
        Container cp = jf.getContentPane();
        cp.setLayout(null);
        
        jtName.setBounds(150,50,100,20);
        cp.add(jtName);
        jb1.setBounds(10,50,100,20);
        cp.add(jb1);
 
        jtPwd.setBounds(150,100,100,20);
        cp.add(jtPwd);
        jb2.setBounds(10,100,100,20);
        cp.add(jb2);
        
        jbLogin.setBounds(20, 150, 100, 20);
        jbquxiao.setBounds(150, 150, 100, 20);
        cp.add(jbLogin);
        cp.add(jbquxiao);
        
        jbquxiao.addActionListener(new ActionListener() {
            
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        
        jbLogin.addActionListener(new ActionListener(){
            
            public void actionPerformed(ActionEvent e){
                String name = jtName.getText();
                String pwd = jtPwd.getText();
                String aa = name+pwd;
                if(aa.equals(mima)){            //Java中判断两个字符串相等用equals()函数。
                    jf.dispose();    //关闭登陆面板
                    Container cp2 = jfZhu.getContentPane();
                    cp2.setLayout(null);
                    
                    jlZhu.setBounds(0, 0, 400, 300);
                    cp2.add(jlZhu);
                    jfZhu.setSize(400,300);
                    jfZhu.setVisible(true);
                }
                else{
                    if(0<=count&&count<3){
                        Container cp3 = jfCuo.getContentPane();
                        cp3.setLayout(null);
                        
                        jlCuo.setBounds(0, 0, 400, 300);
                        cp3.add(jlCuo);
                        jfCuo.setSize(400,300);
                        jfCuo.setVisible(true);
                        count++;
                    }
                    else{
                        if(count>=3)
                            System.exit(0);
                    }
                }
            }
        });
        
        jf.setSize(400, 300);
        jf.setVisible(true);
        
    }
}