Card Layout , Null layout, Flow Layout , Border Layout

package cardlayout;
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class CardLayoutDemo {
            JFrame frame = new JFrame("CardLayout demo");
            JPanel panelCont = new JPanel(); // panel cu alte 2 panouri
            JPanel panelFirst = new JPanel();
            JPanel panelSecond = new JPanel();
            JPanel panelThird = new JPanel();
            JButton buttonOne = new JButton("Switch to second panel/workspace");
            JButton buttonSecond = new JButton("Switch to third panel/workspace");
            JButton buttonThird = new JButton("Switch to first panel-EAST");
            CardLayout cl = new CardLayout();

    public CardLayoutDemo() {
    panelCont.setLayout(cl);

        panelFirst.add(buttonOne);
        panelSecond.add(buttonSecond);

        panelFirst.setBackground(Color.BLUE);
        panelSecond.setBackground(Color.GREEN);

        panelThird.setBackground(Color.ORANGE);
        panelThird.setLayout(new BorderLayout());
        panelThird.add(new JButton("Hello Guys  -- NORTH!"),BorderLayout.NORTH);
        DefaultListModel dlm = new DefaultListModel();
        dlm.addElement("WEST !");
        dlm.addElement("This is a list !");
        dlm.addElement("On West");
        panelThird.add(new JList(dlm),BorderLayout.WEST);
        panelThird.add(new JLabel("CENTER.Asta e facut cu BorderLayout!"),BorderLayout.CENTER);
        JTextField tf = new JTextField("Write Here!      ---   SOUTH");
        tf.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){dlm.addElement(e.getActionCommand());}});
        panelThird.add(tf,BorderLayout.SOUTH);

        panelThird.add(buttonThird,BorderLayout.EAST);


        panelSecond.setLayout(new FlowLayout());

        panelSecond.add(new JLabel("Acest layout este de tipul FlowLayout"));
        panelSecond.add(new JButton("1 - 2 - 3"));
        panelSecond.add(new JTextField("TEXTFIELD de lungimea textului initial"));

        panelFirst.setLayout(null);
        JTextField tf2 = new JTextField("Acesta este un Layout NULL ( mai putin recomandat )");
        tf2.setBounds(100,200,370,180);
        panelFirst.add(tf2);
        buttonOne.setBounds(50,50,250,150);

        panelCont.add(panelFirst, "1");
        panelCont.add(panelSecond, "2");
        panelCont.add(panelThird,"3");


        cl.show(panelCont, "1"); // 1 afiseaza firstPanel, 2 te duce pe secondPanel

            buttonOne.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
            cl.show(panelCont, "2");
            }
            });
            buttonSecond.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
            cl.show(panelCont, "3");
            }
            });
            buttonThird.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
            cl.show(panelCont, "1");
            }
            });

    frame.add(panelCont);
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    frame.pack();
    frame.setSize(500,500);
    frame.setVisible(true);
}
        public static void main(String[] args) {
            SwingUtilities.invokeLater(new Runnable() {
            @Override
                public void run() {
                   new CardLayoutDemo();
                }
             });
        }
}