A Simple Login Form in JAVA Swing

How can I make login form with java gui? this is the way to make login form in java gui and open a new form after clicking, How to make login form with java gui and open a new frame with input username and password

With this source code, you can make a login form with java gui and then, when you click at login button, you will redirect to a new frame in java gui, this is very important if you want to make a big project with java. This is will make securable program. With this frame, you must type your username and password. 

/*
 * login_form.java
 *
 * Created on July 16, 2013, 10:57 AM
 */

package loginform;

/**
 *
 * @author  LTIET_CSE_DEPT
 */
public class login_form extends javax.swing.JFrame {
   
    /** Creates new form login_form */
    public login_form() {
        initComponents();
        jOptionPane1.setVisible(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.
     */
    // //GEN-BEGIN:initComponents
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        uname = new javax.swing.JTextField();
        ok = new javax.swing.JButton();
        cancel_btn = new javax.swing.JButton();
        upass = new javax.swing.JPasswordField();
        jOptionPane1 = new javax.swing.JOptionPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Name:");

        jLabel2.setText("Password:");

        ok.setText("OK");
        ok.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                okActionPerformed(evt);
            }
        });

        cancel_btn.setText("Cancel");
        cancel_btn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cancel_btnActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(18, 18, 18)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(51, 51, 51)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(upass)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(ok)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(cancel_btn))
                            .addComponent(uname, javax.swing.GroupLayout.DEFAULT_SIZE, 149, Short.MAX_VALUE)))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(84, 84, 84)
                        .addComponent(jOptionPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 155, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(242, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(36, 36, 36)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(uname, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(upass, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(35, 35, 35)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(ok)
                    .addComponent(cancel_btn))
                .addGap(28, 28, 28)
                .addComponent(jOptionPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(151, Short.MAX_VALUE))
        );

        pack();
    }// //GEN-END:initComponents

    private void okActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_okActionPerformed
        if(uname.getText().equals("Sagar"))
        {
            if(upass.getText().equals("123"))
            {
                jOptionPane1.showMessageDialog(this,"Welcome");
            }
            else{jOptionPane1.showMessageDialog(this,"Enter Correct Password");}
        }
        else{jOptionPane1.showMessageDialog(this,"Enter Correct UserName");}
    }//GEN-LAST:event_okActionPerformed

    private void cancel_btnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cancel_btnActionPerformed
        System.exit(0);
    }//GEN-LAST:event_cancel_btnActionPerformed
   
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new login_form().setVisible(true);
            }
        });
    }
   
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton cancel_btn;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JOptionPane jOptionPane1;
    private javax.swing.JButton ok;
    private javax.swing.JTextField uname;
    private javax.swing.JPasswordField upass;
    // End of variables declaration//GEN-END:variables
   
}