รบกวนช่วยดู CODE JAVA หน่อยครับ >> ต้องการ โค้ด ที่เวลา กดปุ่ม OK หลังจาก ใส่ พาส กะ ชื่อถูกต้อง ให้ลิงค์ไปที่หน้า frmWelcome<<

/*
 * FrmLogin.java
 *
 * Created on 30 มิถุนายน 2555, 11:06 น.
 */

package com.sau;
import java.awt.*;//เวลานำรูปมาใช้ ต้อง import ก่อน
import javax.swing.JOptionPane;
/**
 *
 * @author  Administrator
 */
public class FrmLogin extends javax.swing.JFrame {
    
    /** Creates new form FrmLogin */
    public FrmLogin() {
        initComponents();
        setLocationRelativeTo(getRootPane());
        Image imgTitle=Toolkit.getDefaultToolkit().getImage(getClass().getResource("/image/dng_gmslogo.png"));
        setIconImage(imgTitle);
    }
    
    /** 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.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jSeparator1 = new javax.swing.JSeparator();
        jLabel2 = new javax.swing.JLabel();
        txtUname = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        txtPassw = new javax.swing.JTextField();
        jSeparator2 = new javax.swing.JSeparator();
        btnOK = new javax.swing.JButton();
        btnCancel = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("โปรแกรม Log In");

        jLabel1.setFont(new java.awt.Font("2005_iannnnnDVD", 0, 24));
        jLabel1.setForeground(new java.awt.Color(102, 51, 255));
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel1.setText("กรุณา Log In ก่อนเข้าใช้งาน");

        jLabel2.setFont(new java.awt.Font("2005_iannnnnDVD", 0, 24));
        jLabel2.setForeground(new java.awt.Color(255, 0, 204));
        jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel2.setText("ป้อนชื่อผู้ใช้ :");

        jLabel3.setFont(new java.awt.Font("2005_iannnnnDVD", 0, 24));
        jLabel3.setForeground(new java.awt.Color(255, 0, 204));
        jLabel3.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel3.setText("ป้อนรหัสผ่าน :");

        btnOK.setFont(new java.awt.Font("AngsanaUPC", 1, 18));
        btnOK.setForeground(new java.awt.Color(0, 153, 255));
        btnOK.setText("ตกลง");
        btnOK.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnOKActionPerformed(evt);
            }
        });

        btnCancel.setFont(new java.awt.Font("AngsanaUPC", 1, 18));
        btnCancel.setForeground(new java.awt.Color(0, 153, 255));
        btnCancel.setText("ยกเลิก");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jSeparator2, javax.swing.GroupLayout.DEFAULT_SIZE, 548, Short.MAX_VALUE)
                .addContainerGap())
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jSeparator1, javax.swing.GroupLayout.DEFAULT_SIZE, 548, Short.MAX_VALUE)
                .addContainerGap())
            .addGroup(layout.createSequentialGroup()
                .addGap(99, 99, 99)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel3)
                    .addComponent(jLabel2))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(txtUname, javax.swing.GroupLayout.PREFERRED_SIZE, 213, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(txtPassw, javax.swing.GroupLayout.DEFAULT_SIZE, 213, Short.MAX_VALUE))
                .addContainerGap())
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(229, Short.MAX_VALUE)
                .addComponent(btnOK)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(btnCancel)
                .addGap(203, 203, 203))
            .addGroup(layout.createSequentialGroup()
                .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 548, Short.MAX_VALUE)
                .addGap(20, 20, 20))
        );

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {txtPassw, txtUname});

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {btnCancel, btnOK});

        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addGap(18, 18, 18)
                .addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel3)
                            .addComponent(txtPassw, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addComponent(txtUname, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(63, 63, 63)
                .addComponent(jSeparator2, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(btnOK)
                    .addComponent(btnCancel))
                .addContainerGap(74, Short.MAX_VALUE))
        );

        layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {txtPassw, txtUname});

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

    private void btnOKActionPerformed(java.awt.event.ActionEvent evt) {                                      
        if(txtUname.getText().trim().equals("")){
            JOptionPane.showMessageDialog(null,"ป้อนชื่อผู้ใช้ด้วยค่ะ");
        }else if(txtPassw.getText().trim().equals("")){
            JOptionPane.showMessageDialog(null,"ป้อนรหัสผ่านด้วยค่ะ" );
        }else{
            CheckLogin cl = new CheckLogin();//สร้างตัวแทนของคลาส
            if(cl.checkUP(txtUname.getText().trim(), txtPassw.getText().trim()))/*ต้องส่งค่าไปให้ คลาส CheckLogin เพื่อตรวจสอบ*/{
            JOptionPane.showMessageDialog(null,"ยินดีต้อนรับ" );
            
           
          
             
           
            }else{
                
            JOptionPane.showMessageDialog(null,"ชื่อผู้ใช้ รหัสผ่านไม่ถูกต้อง!!!");
            txtPassw.setText("");
            txtUname.setText("");
            
            }
                    
            }        // TODO add your handling code here:
    }                                     
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new FrmLogin().setVisible(true);
            }
        });
    }
    
    // Variables declaration - do not modify                     
    private javax.swing.JButton btnCancel;
    private javax.swing.JButton btnOK;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JSeparator jSeparator1;
    private javax.swing.JSeparator jSeparator2;
    private javax.swing.JTextField txtPassw;
    private javax.swing.JTextField txtUname;
    // End of variables declaration                   
    
}


เช็ค log in

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.sau;

/**
 *
 * @author Administrator
 */
public class CheckLogin {
    public boolean checkUP(String u,String p){
        if(u.equals("abc")&& p.equals("123")){
            return true; 
        }else{
            return false;
      }
 
    }
}

หน้าโปรแกรม ยินดีต้อนรับ 

/*
 * FrmWelcome.java
 *
 * Created on 30 มิถุนายน 2555, 9:37 น.
 */

package com.sau;

import javax.swing.JOptionPane;

/**
 *
 * @author  Administrator
 */
public class FrmWelcome extends javax.swing.JFrame {
    
    /** Creates new form FrmWelcome */
    public FrmWelcome() {
        initComponents();
        setLocationRelativeTo(getRootPane());//ทำให้รันอยู่ตรงกลางหน้าจอ//  
    }
    
    /** 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.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        txtName = new javax.swing.JTextField();
        jSeparator1 = new javax.swing.JSeparator();
        jSeparator2 = new javax.swing.JSeparator();
        btnOK = new javax.swing.JButton();
        btnExit = new javax.swing.JButton();
        btnCancel = new javax.swing.JButton();
        jSeparator3 = new javax.swing.JSeparator();
        lblShowname = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("โปรแกรมยินดีต้อนรับ");

        jLabel1.setFont(new java.awt.Font("2005_iannnnnDVD", 1, 36));
        jLabel1.setForeground(new java.awt.Color(255, 102, 0));
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel1.setText("โปรแกรมยินดีต้อนรับ");

        jLabel2.setFont(new java.awt.Font("2005_iannnnnDVD", 1, 24));
        jLabel2.setForeground(new java.awt.Color(255, 153, 0));
        jLabel2.setText("ป้อนชื่อ");

        btnOK.setFont(new java.awt.Font("AngsanaUPC", 1, 18));
        btnOK.setText("ตกลง");
        btnOK.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnOKActionPerformed(evt);
            }
        });

        btnExit.setFont(new java.awt.Font("AngsanaUPC", 1, 18));
        btnExit.setText("ปิดโปรแกรม");
        btnExit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnExitActionPerformed(evt);
            }
        });

        btnCancel.setFont(new java.awt.Font("AngsanaUPC", 1, 18));
        btnCancel.setText("ยกเลิก");
        btnCancel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnCancelActionPerformed(evt);
            }
        });

        lblShowname.setFont(new java.awt.Font("AngsanaUPC", 1, 24));
        lblShowname.setForeground(new java.awt.Color(0, 0, 255));
        lblShowname.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        lblShowname.setText("??????????");

        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()
                        .addContainerGap()
                        .addComponent(jSeparator2, javax.swing.GroupLayout.DEFAULT_SIZE, 430, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jLabel2)
                        .addGap(18, 18, 18)
                        .addComponent(txtName, javax.swing.GroupLayout.PREFERRED_SIZE, 296, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jSeparator1, javax.swing.GroupLayout.DEFAULT_SIZE, 430, Short.MAX_VALUE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 430, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(81, 81, 81)
                        .addComponent(btnOK)
                        .addGap(18, 18, 18)
                        .addComponent(btnCancel)
                        .addGap(18, 18, 18)
                        .addComponent(btnExit))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jSeparator3, javax.swing.GroupLayout.DEFAULT_SIZE, 430, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(lblShowname, javax.swing.GroupLayout.DEFAULT_SIZE, 430, Short.MAX_VALUE)))
                .addContainerGap())
        );

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {btnCancel, btnExit, btnOK});

        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(25, 25, 25)
                .addComponent(jLabel1)
                .addGap(18, 18, 18)
                .addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(txtName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(27, 27, 27)
                .addComponent(jSeparator2, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(btnCancel)
                    .addComponent(btnOK)
                    .addComponent(btnExit))
                .addGap(18, 18, 18)
                .addComponent(jSeparator3, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(lblShowname)
                .addContainerGap(23, Short.MAX_VALUE))
        );

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

    private void btnOKActionPerformed(java.awt.event.ActionEvent evt) {                                      
        // TODO add your handling code here:
        if(txtName.getText().trim().equals("")){
           JOptionPane.showMessageDialog(null,"กรุณาป้อนชื่อ","คำเตื่อน",JOptionPane.WARNING_MESSAGE);
        
        }else{
        
         lblShowname.setText(txtName.getText().trim());
        
        }
}                                     

    private void btnCancelActionPerformed(java.awt.event.ActionEvent evt) {                                          
       // TODO add your handling code here:
        txtName.setText("");
        lblShowname.setText("??????????");
            
    }                                         

    private void btnExitActionPerformed(java.awt.event.ActionEvent evt) {                                        
            // TODO add your handling code here:
        if (JOptionPane.showConfirmDialog(null,"คุณต้องการปิดโปรแกรมใช่หรือไม่?","ยืนยัน",JOptionPane.YES_NO_OPTION)==JOptionPane.YES_OPTION){
             dispose();
        }
        
    }                                       
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new FrmWelcome().setVisible(true);
            }
        });
    }
    
    // Variables declaration - do not modify                     
    private javax.swing.JButton btnCancel;
    private javax.swing.JButton btnExit;
    private javax.swing.JButton btnOK;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JSeparator jSeparator1;
    private javax.swing.JSeparator jSeparator2;
    private javax.swing.JSeparator jSeparator3;
    private javax.swing.JLabel lblShowname;
    private javax.swing.JTextField txtName;
    // End of variables declaration                   
    
}