Can't change the CardLayout.

Question

Sorry, can someone help me with this code. I can't change the cardlayout when i try to seperate the JButton and the cardLayout. However, when i try it in one class, there is no problem. Can help me with this and give me some advise? I am learning how to seperate to classes so that the code will not look so messy. Is this the correct way of doing?
/**********This is the main class*************/
import javax.swing.*;
import java.awt.*;
public class PlayCard extends JFrame
     NorthConsole nc = new NorthConsole();
     ChangingCard cc = new ChangingCard();
     JFrame f1;
     JPanel mainPanel = new JPanel();
     public PlayCard()
          f1 = new JFrame("Card Panel");
          f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          f1.setSize(400,200);
          mainPanel.setLayout(new BorderLayout());
          mainPanel.add(nc.northCard(),BorderLayout.NORTH);
          mainPanel.add(cc.cardPanel(),BorderLayout.SOUTH);
          f1.getContentPane().add(mainPanel);
          f1.setVisible(true);
     public static void main(String[] args)
          PlayCard pc = new PlayCard();
/*********This is the Panel that contain the button that does the changing*****/
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class NorthConsole implements ActionListener
     JButton b3 = new JButton("Display card 1");     
     JButton b4 = new JButton("Display card 2");     
     ChangingCard ch = new ChangingCard();
     JPanel northCard()
          JPanel nc1 = new JPanel();
          b3.addActionListener(this);
          b4.addActionListener(this);     
          nc1.add(b3);
          nc1.add(b4);
          return nc1;
     public void actionPerformed(ActionEvent f)
          ch.getCard();
          Object source = f.getSource();
          if(source==b3)
               ch.displayShow1();
          }//end of b1 action
          if(source==b4)
               ch.displayShow2();     
          }//end of b2 action
}//end of class
/************This is the CardLayout Class******************/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ChangingCard
     String card1But = "Panel 1 with Button 1";
     String card2But = "Panel 2 with Button 2";
     JButton b1 = new JButton("Card 1");
     JButton b2 = new JButton("Card 2");
     JPanel cMain = new JPanel(new CardLayout());
     JPanel c1 = new JPanel();
     JPanel c2 = new JPanel();
     CardLayout cl;
     JPanel cardPanel()
          c1.add(b1);
          c2.add(b2);
          cMain.add(c1,card1But);     
          cMain.add(c2,card2But);
          return cMain;
     public CardLayout getCard()
          cl = (CardLayout)(cMain.getLayout());
          return cl;
     public void displayShow1()
          getCard().show(cMain,card1But);
          System.out.println("Hello");     
     public void displayShow2()
          getCard().show(cMain,card2But);
          System.out.println("Hello2");
}

Answer 1

try it this way
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class PlayCard extends JFrame
  ChangingCard cc = new ChangingCard();
  NorthConsole nc = new NorthConsole(cc);
  public PlayCard()
    setTitle("Card Panel");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(400,200);
    JPanel mainPanel = new JPanel(new BorderLayout());
    mainPanel.add(nc,BorderLayout.NORTH);
    mainPanel.add(cc,BorderLayout.SOUTH);
    getContentPane().add(mainPanel);
  public static void main(String[] args){new PlayCard().setVisible(true);}
class NorthConsole extends JPanel
  ChangingCard cc;
  public NorthConsole(ChangingCard c)
    cc = c;
    final JButton b3 = new JButton("Display card 1");
    b3.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent f){
        cc.displayShow1();}});
    JButton b4 = new JButton("Display card 2");
    b4.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent f){
        cc.displayShow2();}});
    add(b3);
    add(b4);
class ChangingCard extends JPanel
  String card1But = "Panel 1 with Button 1";
  String card2But = "Panel 2 with Button 2";
  CardLayout cl;
  public ChangingCard()
    cl = new CardLayout();
    setLayout(cl);
    JPanel c1 = new JPanel();
    c1.add(new JButton("Card 1"));
    JPanel c2 = new JPanel();
    c2.add(new JButton("Card 2"));
    add(card1But,c1);
    add(card2But,c2);
  public void displayShow1(){cl.show(this,card1But);}
  public void displayShow2(){cl.show(this,card2But);}
}