怎么写啊，自己怎么写都是错的，而且提示错误都是满满的我是新人，今年刚学，在jdk的平台下用，求大神帮助

你这是作业帖嚒？敢不敢给出一点你自己写的代码，即使是错的，至少我能知道你哪里不懂

就建一张用户表,用JDBC连一下数据库,当用户和密码都输入正确时,就提示登录成功就好了.(注意SQL注入,当然这个是比较深的问题了)

import java.awt.*;

import javax.swing.*;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class UserFrame extends JFrame {
    public UserFrame() {
        try {
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    private void jbInit() throws Exception {
        getContentPane().setLayout(null);
        lblName.setText("用户名:");
        lblName.setBounds(new Rectangle(26, 52, 60, 32));
        btnOK.setBounds(new Rectangle(38, 196, 91, 38));
        btnOK.setText("确定");
        btnOK.addActionListener(new UserFrame_btnOK_actionAdapter(this));
        btnCencal.setBounds(new Rectangle(173, 196, 91, 37));
        btnCencal.setText("取消");
        btnCencal.addActionListener(new UserFrame_btnCencal_actionAdapter(this));
        txtName.setBounds(new Rectangle(126, 52, 111, 31));
        txtPWD.setBounds(new Rectangle(126, 135, 110, 31));
        lblMessage.setBounds(new Rectangle(83, 92, 165, 28));
        this.getContentPane().add(lblName);
        this.getContentPane().add(lblPWD);
        this.getContentPane().add(btnOK);
        this.getContentPane().add(btnCencal);
        this.getContentPane().add(txtName);
        this.getContentPane().add(txtPWD);
        this.getContentPane().add(lblMessage);
        lblPWD.setText("密码:");
        lblPWD.setBounds(new Rectangle(26, 131, 70, 37));
    }

    JLabel lblName = new JLabel();
    JLabel lblPWD = new JLabel();
    JButton btnOK = new JButton();
    JButton btnCencal = new JButton();
    JTextField txtName = new JTextField();
    JTextField txtPWD = new JTextField();
    JLabel lblMessage = new JLabel();
    public void btnOK_actionPerformed(ActionEvent e) {
        String User;
        String PWD;
        User=txtName.getText();
        PWD=txtPWD.getText();
        if(User.equals("admin")&&PWD.equals("admin888")){
            lblMessage.setText("登陆成功");
            AddUserinfo au = new AddUserinfo();
            au.setTitle("信息修改器");
            au.setBounds(50, 50, 400, 310);
            au.setVisible(true);
            this.dispose();
        }else{
            lblMessage.setText("登陆失败");
        }
    }

    public void btnCencal_actionPerformed(ActionEvent e) {
        System.exit(0);
    }


}


class UserFrame_btnCencal_actionAdapter implements ActionListener {
    private UserFrame adaptee;
    UserFrame_btnCencal_actionAdapter(UserFrame adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.btnCencal_actionPerformed(e);
    }
}


class UserFrame_btnOK_actionAdapter implements ActionListener {
    private UserFrame adaptee;
    UserFrame_btnOK_actionAdapter(UserFrame adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.btnOK_actionPerformed(e);
    }
    public static void main(String [] args){
        UserFrame uf=new UserFrame();
        uf.setBounds(0,0,350,300);
        uf.setTitle("登陆器");
        uf.setVisible(true);
    }
}
有点乱

代码调试与错误分析:先把错误提示贴出来，再把错误相关的代码贴出来。。。而不是把所有代码都贴出来，长的代码没几个人会耐下心来慢慢看的.

谢谢提示