scrip From Login :
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/

package multiuser;
import conn.koneksi;
import koneksi.connection;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.swing.JOptionPane;
/**
*
* @author D
*/
public class loginM extends javax.swing.JFrame {
koneksi koneksi;
Statement statement;
ResultSet resultSet;
public static int kondisiLogin=3;
public static String userLogin="tidak terdeteksi";
connection c;
/**
* Creates new form loginM
*/
public loginM() {
initComponents();
}
private void prosesLogin() {
String level = "";
try {
String sql = "select username,password,level from user where username='"
+ txtUser2.getText() +"' AND password = md5('"+txtPassword2.getText()+"' )";

statement = c.connect.createStatement();
resultSet = statement.executeQuery(sql);

while (resultSet.next()) {
level = resultSet.getString(3);
}
if (level.equals("")) {
JOptionPane.showMessageDialog(null, "USERNAME atau PASSWORD SALAH");
clear();
}
else {
if (level.equals("0")) {
new Menu_Utama().setVisible(true);
kondisiLogin = 0;

this.dispose();
} else if (level.equals("1")) {
new Menu_Utama().setVisible(true);
kondisiLogin = 1;
this.dispose();
} else {
new Menu_Utama().setVisible(true);
kondisiLogin = 3;
this.dispose();
}
userLogin = txtUser2.getText();
}

} catch (Exception e) {
JOptionPane.showMessageDialog(null, e.getMessage());
}
}
private void clear(){
txtUser2.setText("");
txtPassword2.setText("");
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

txtUser2 = new javax.swing.JTextField();
txtPassword2 = new javax.swing.JPasswordField();
jButton1 = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jButton1.setText("Login");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});

jLabel1.setText("User :");

jLabel2.setText("Password :");

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(47, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton1)
.addGap(171, 171, 171))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addComponent(txtUser2, javax.swing.GroupLayout.PREFERRED_SIZE, 123, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2)
.addGap(18, 18, 18)
.addComponent(txtPassword2, javax.swing.GroupLayout.PREFERRED_SIZE, 123, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(95, 95, 95))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(71, 71, 71)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(txtUser2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(txtPassword2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addGap(18, 18, 18)
.addComponent(jButton1)
.addContainerGap(42, Short.MAX_VALUE))
);

pack();
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
prosesLogin();

}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tu...feel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(loginM.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(loginM.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(loginM.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(loginM.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>

/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new loginM().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JPasswordField txtPassword2;
private javax.swing.JTextField txtUser2;
// End of variables declaration
}

Scrip Menu Utama :
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/

package multiuser;
import java.sql.ResultSet;
import java.sql.Statement;
import conn.koneksi;

/**
*
* @author D
*/
public class Menu_Utama extends javax.swing.JFrame {
//koneksi koneksi;
public static int kodeLogin= 3 ;
ResultSet resultSet;
Statement statement;
public int login = 3;

/**
* Creates new form Menu_Utama
*/
public Menu_Utama() {
initComponents();
setLocationRelativeTo(null);

kodeLogin = login;
belumLogin();

if (login == 0) {
loginAdmin();
} else if (login == 1) {
loginKaryawan();
} else {
belumLogin();
}

}

Menu_Utama(int i) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}


private void belumLogin() {
jMenu2.setEnabled(false);
jMenu3.setEnabled(false);
jMenu4.setEnabled(false);
jMenu5.setVisible(true);
jMenu5.setEnabled(false);
subMenuLogin.setEnabled(true);
subMenuRegistrasi.setEnabled(false);
subMenuLogout.setEnabled(false);
}

private void loginAdmin() {
jMenu2.setEnabled(true);
jMenu3.setEnabled(true);
jMenu4.setEnabled(true);
jMenu5.setEnabled(true);
jMenu5.setVisible(true);
subMenuRegistrasi.setEnabled(true);
subMenuLogout.setEnabled(true);
subMenuLogin.setEnabled(false);
}

private void loginKaryawan() {
jMenu2.setEnabled(true);
jMenu3.setEnabled(true);
jMenu4.setEnabled(true);
jMenu5.setEnabled(true);
jMenu5.setVisible(false);
subMenuRegistrasi.setEnabled(false);
subMenuLogout.setEnabled(true);
subMenuLogin.setEnabled(false);
}


/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jDialog1 = new javax.swing.JDialog();
jTextField1 = new javax.swing.JTextField();
jPasswordField1 = new javax.swing.JPasswordField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jDesktopPane1 = new javax.swing.JDesktopPane();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
subMenuLogin = new javax.swing.JMenuItem();
subMenuRegistrasi = new javax.swing.JMenuItem();
subMenuLogout = new javax.swing.JMenuItem();
jMenu2 = new javax.swing.JMenu();
jMenu3 = new javax.swing.JMenu();
jMenu4 = new javax.swing.JMenu();
jMenu5 = new javax.swing.JMenu();

jLabel1.setText("User Name : ");

jLabel2.setText("Password : ");

jButton1.setText("Login");

jButton2.setText("Batal");

javax.swing.GroupLayout jDialog1Layout = new javax.swing.GroupLayout(jDialog1.getContentPane());
jDialog1.getContentPane().setLayout(jDialog1Layout);
jDialog1Layout.setHorizontalGroup(
jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jDialog1Layout.createSequentialGroup()
.addGroup(jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jDialog1Layout.createSequentialGroup()
.addGap(54, 54, 54)
.addGroup(jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel2)
.addComponent(jLabel1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, 127, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 127, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jDialog1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton1)
.addGap(18, 18, 18)
.addComponent(jButton2)))
.addContainerGap(68, Short.MAX_VALUE))
);
jDialog1Layout.setVerticalGroup(
jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jDialog1Layout.createSequentialGroup()
.addGap(63, 63, 63)
.addGroup(jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1))
.addGap(18, 18, 18)
.addGroup(jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addGap(33, 33, 33)
.addGroup(jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2))
.addContainerGap(55, Short.MAX_VALUE))
);

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setPreferredSize(new java.awt.Dimension(1277, 770));

jDesktopPane1.setBackground(new java.awt.Color(0, 153, 204));

javax.swing.GroupLayout jDesktopPane1Layout = new javax.swing.GroupLayout(jDesktopPane1);
jDesktopPane1.setLayout(jDesktopPane1Layout);
jDesktopPane1Layout.setHorizontalGroup(
jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 550, Short.MAX_VALUE)
);
jDesktopPane1Layout.setVerticalGroup(
jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 368, Short.MAX_VALUE)
);

getContentPane().add(jDesktopPane1, java.awt.BorderLayout.CENTER);

jMenuBar1.setFocusTraversalPolicyProvider(true);

jMenu1.setText("File");

subMenuLogin.setText("Login");
subMenuLogin.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
subMenuLoginActionPerformed(evt);
}
});
jMenu1.add(subMenuLogin);

subMenuRegistrasi.setText("Manajemen User");
subMenuRegistrasi.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
subMenuRegistrasiActionPerformed(evt);
}
});
jMenu1.add(subMenuRegistrasi);

subMenuLogout.setText("Logout");
jMenu1.add(subMenuLogout);

jMenuBar1.add(jMenu1);

jMenu2.setText("Edit");
jMenuBar1.add(jMenu2);

jMenu3.setText("jMenu3");
jMenuBar1.add(jMenu3);

jMenu4.setText("jMenu4");
jMenuBar1.add(jMenu4);

jMenu5.setText("jMenu5");
jMenuBar1.add(jMenu5);

setJMenuBar(jMenuBar1);

pack();
}// </editor-fold>

private void subMenuLoginActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
/* Mlogin mlogin = new Mlogin();
jDesktopPane1.add(mlogin);
mlogin.setVisible(true); */
loginM fs = new loginM();
fs.setVisible(true);
/* jDialog1.setSize(338, 230);
jDialog1.setLocationRelativeTo(null);
jDialog1.setVisible(true); */
// new tes().setVisible(true);
// dispose();
}

private void subMenuRegistrasiActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
manager_user mDua = new manager_user();
jDesktopPane1.add(mDua);
mDua.setVisible(true);

}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tu...feel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Menu_Utama.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Menu_Utama.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Menu_Utama.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Menu_Utama.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>

/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
//new Menu_Utama().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JDesktopPane jDesktopPane1;
private javax.swing.JDialog jDialog1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenu jMenu3;
private javax.swing.JMenu jMenu4;
private javax.swing.JMenu jMenu5;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JPasswordField jPasswordField1;
private javax.swing.JTextField jTextField1;
private javax.swing.JMenuItem subMenuLogin;
private javax.swing.JMenuItem subMenuLogout;
private javax.swing.JMenuItem subMenuRegistrasi;
// End of variables declaration
}