JAVA - Lập trình giao diện form bằng SWING

public class HelloFrame extends JFrame {
    public HelloFrame() {
        JLabel jlbHello = new JLabel("Xin chào");
        add(jlbHello);
        this.setSize(100, 100);
        pack();//Dong goi
        setVisible(true);//True: Cho phep cua so hien ra
    }
    
    public static void main(String args[]) {
        new HelloFrame();
    }
}

public class JlabelDemo extends JPanel {
    JLabel jlbLabel1, jlbLabel2, jlbLabel3;
    public JlabelDemo() {
        //Tao icon voi hinh anh tuy thich
        ImageIcon icon = new ImageIcon(getClass().getResource("avatar-mini.jpg"), "Java 2");
        //Grid Layout chia thanh 3 cot va 1 hang
        setLayout(new GridLayout(3, 2));
        // Dat vi tri cua Text o giua (CENTER), trai (LEFT), phai (RIGHT), 
        // tren cung (TOP) hoac duoi cung (BOTTOM)
        jlbLabel1 = new JLabel("Label1 chua Image va Text", icon, JLabel.RIGHT);
        jlbLabel1.setVerticalTextPosition(JLabel.BOTTOM);
        jlbLabel1.setHorizontalTextPosition(JLabel.RIGHT);
        jlbLabel2 = new JLabel("Label 2 chi chua Text");
        //Label 3 chi chua icon
        jlbLabel3 = new JLabel(icon);
        // Them labels vao Panel
        add(jlbLabel1);
        add(jlbLabel2);
        add(jlbLabel3);
    }
    public static void main(String[] args) {
        JFrame frame = new JFrame("JLabel Demo");
        frame.setContentPane(new JlabelDemo());
        frame.pack();
        frame.setVisible(true);
    }
}

class MenuDemo extends JFrame 
{
    private JMenuBar menuBar;
    private JMenu mainMenu, helpMenu;
    private JMenuItem login,logout,exit, edit, view, about;    
    private JPanel mainPanel;
    private JMenuItem createMenuItem(String name){
        JMenuItem menuItem=new JMenuItem(name);
        return menuItem;
    }
    
    private void createMenu(){
        login=createMenuItem("Login"); 
        logout=createMenuItem("Logout");
        exit=createMenuItem("Exit");
        edit=createMenuItem("Edit");
        view=createMenuItem("View");
        about=createMenuItem("About");
        menuBar = new JMenuBar();
        mainMenu = new JMenu("File");
        helpMenu = new JMenu("Help");
        menuBar.add(mainMenu);
        menuBar.add(helpMenu);        
        mainMenu.add(login); 
        mainMenu.add(logout); 
        mainMenu.add(edit); 
        mainMenu.add(view); 
        mainMenu.add(exit); 
        helpMenu.add(about); 
        setJMenuBar(menuBar);
    }

    public MenuDemo()
    {
        mainPanel =new JPanel(new GridLayout(5,1,2,2));
        createMenu();
        setContentPane(mainPanel);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setTitle("EditPlus");
        pack();
    }
    
    public static void main(String[] args) 
    {
        MenuDemo s=new MenuDemo(); s.pack();
        s.show();
    }
}

class MenuDemo extends JFrame implements ActionListener
{
    private JMenuBar menuBar;
    private JMenu mainMenu, helpMenu;
    private JMenuItem login,logout,exit, edit, view, about;
    private AppMenuListener appMenuLis=new AppMenuListener();
    private JPanel mainPanel;
    private JMenuItem createMenuItem(String name){
        JMenuItem menuItem=new JMenuItem(name);
        menuItem.addActionListener(appMenuLis);
        return menuItem;
    }
    
    private void createMenu(){
        login=createMenuItem("Login"); 
        logout=createMenuItem("Logout");
        exit=createMenuItem("Exit");
        edit=createMenuItem("Edit");
        view=createMenuItem("View");
        about=createMenuItem("About");
        menuBar = new JMenuBar();
        mainMenu = new JMenu("File");
        helpMenu = new JMenu("Help");
        menuBar.add(mainMenu);
        menuBar.add(helpMenu);        
        mainMenu.add(login); 
        mainMenu.add(logout); 
        mainMenu.add(edit); 
        mainMenu.add(view); 
        mainMenu.add(exit); 
        helpMenu.add(about); 
        setJMenuBar(menuBar);
    }
//------------------------------------------------------------------------------------------------------------------
//inner class
//------------------------------------------------------------------------------------------------------------------    class AppMenuListener implements ActionListener {
        public void actionPerformed(ActionEvent e){
            Object itemClicked=e.getSource();
            if(itemClicked==login)    {
                mainPanel.add(new JLabel("Hello"));
                pack();
            }
            else if(itemClicked==exit)    {
                System.exit(1);
            }    
            
        }
    }
//----------------------------------------------------------------------------------------------------------    
    public void actionPerformed(ActionEvent e){
        
    }
//------------------------------------------------------------------------------------------------------------------

    public MenuDemo()
    {
        mainPanel =new JPanel(new GridLayout(0,3,5,5));
        createMenu();
        setContentPane(mainPanel);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setTitle("EditPlus");
        pack();
    }
    public static void main(String[] args) 
    {
        MenuDemo s=new MenuDemo(); s.pack();
        s.show();
    }
}

public class JSplitPaneDemo extends JFrame{
     
        private JPanel logoPane,loginPane;
        private JTextField tfs;
        private JSplitPane mainPane;

        private void createLogoPane(){
            logoPane=new JPanel(new GridLayout(1,1));
            logoPane.setBackground(Color.white);
            logoPane.add(new JLabel(new ImageIcon("bieutuong_java.jpeg")));
        }
        
        private void createLoginPane(){
            loginPane=new JPanel();
            loginPane.setLayout(new BorderLayout());
            loginPane.setBackground(Color.white);
            JPanel headPane=new JPanel();
            JLabel tt=new JLabel("Login",JLabel.CENTER);
            tt.setFont(new javax.swing.plaf.FontUIResource("Arial",Font.BOLD,18));
            headPane.add(tt);        ;
                        
            JPanel bPane=new JPanel(new GridLayout(0,2,5,5));
            bPane.setBorder(BorderFactory.createEmptyBorder(20,15,20,15)); 
            bPane.add(new JLabel("Username"+":",JLabel.RIGHT));
            tfs =new JTextField(12);
            bPane.add(tfs);
            bPane.add(new JLabel("Password"+":",JLabel.RIGHT));
            tfs =new JPasswordField(12);
            bPane.add(tfs);

            JPanel footPane=new JPanel();
            JButton button=new JButton("Login");
            footPane.add(button);
            footPane.setBackground(Color.white);
            bPane.add(footPane,BorderLayout.SOUTH);
            loginPane.add(headPane,BorderLayout.NORTH);
            loginPane.add(bPane,BorderLayout.CENTER);    
        }

        public JSplitPaneDemo(){
            createLogoPane();
            createLoginPane();
            mainPane=new JSplitPane(JSplitPane.VERTICAL_SPLIT,logoPane,loginPane);
            setContentPane(mainPane);
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            setTitle("Online Shopping");
            pack();
       }
        public static void main(String[] args) {
             JSplitPaneDemo s=new  JSplitPaneDemo(); 
             s.pack();
            s.show();
        }
    }