LoginForm

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.SQLException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;


public class LoginForm extends JFrame implements ActionListener{
    JPanel paneltitle = new JPanel(new FlowLayout());
    JPanel panellogin = new JPanel(new GridLayout(2,1));
    JPanel panelbutton = new JPanel(new GridLayout(2,1));
    JTextField txtuser = new JTextField();
    JPasswordField txtpass = new JPasswordField();
    JLabel title = new JLabel("Sign In");
    JButton login = new JButton("Login");
    JButton cancel = new JButton("Cancel");
    public static String UserID;
    public static String UsernameLama;
    public static String RoleUser;

    Connect con = new Connect();

    public void setUI(){
        title.setFont(new Font("Times New Roman", Font.BOLD, 20));
        paneltitle.add(title);
        add(paneltitle, "North");

        panellogin.add(new JLabel("Username"));
        panellogin.add(txtuser);
        panellogin.add(new JLabel("Password"));
        panellogin.add(txtpass);
        add(panellogin, "Center");

        panelbutton.add(login);
        panelbutton.add(cancel);
        add(panelbutton, "South");
        login.addActionListener(this);
        cancel.addActionListener(this);

        add(new JLabel("  "), "West");
        add(new JLabel("  "), "East");
    }

    public LoginForm() {
        setUI();
        setTitle("Login");
        setSize(300, 180);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == login){
            String username = txtuser.getText();
            String userpass = txtpass.getText();

            if(con.executeLogin(username , userpass)==true){
            	try {
					UserID = con.rs.getString(1);
				} catch (SQLException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
                new MainForm();
                JOptionPane.showMessageDialog(null, "Welcome, "+username);
                this.dispose();
            }else if(txtuser.getText().equals("")){
                JOptionPane.showMessageDialog(null, "USERNAME is blank");
            }else if(txtpass.getText().equals("")){
                JOptionPane.showMessageDialog(null, "PASSWORD is blank");
            }else if(con.executeLogin(username , userpass)==false){
                JOptionPane.showMessageDialog(null, "Invalid USERNAME and PASSWORD");
            }
        }else if(e.getSource() == cancel){
            new MenuForm();
            this.dispose();
        }
    }

}