Piramidalna nomce

/*
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 * and open the template in the editor.
 */
package piramidalna;

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextArea;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 *
 * @author Mitko
 */
public class Piramidalna extends JFrame implements ActionListener{

    JPanel p1,p2,home,main;
    JComboBox<String> combo;
    JTextArea txt;
    JLabel iznos,welcome,conf;
    JButton changeconf,b1,b2,b3,a1,a2,a3;
    JSlider slider;
    String[] s={"ASUS","ACER","Toshiba","DELL"};


    public Piramidalna()
    {
        this.setSize(500, 500);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLayout(new BorderLayout());
        this.setResizable(false);

        p1=new JPanel();
        p2=new JPanel();
        home=new JPanel();

        changeconf=new JButton("Change Configuration");
        a1=new JButton("Previous");
        a2=new JButton("Go Back to Home");
        a3=new JButton("Next");

        b1=new JButton("Previous");
        b2=new JButton("Go Back to Home");
        b3=new JButton("Next");

        welcome=new JLabel("Welcome to our computer shop!!!",JLabel.CENTER);
        conf=new JLabel("Your configuration costs 0$",JLabel.LEFT);
        txt=new JTextArea(6,30);

        JPanel gore=new JPanel();
        gore.setLayout(new BorderLayout());
        gore.add(welcome,BorderLayout.NORTH);
        gore.add(conf,BorderLayout.CENTER);

        home.setLayout(new BorderLayout());
        home.add(gore,BorderLayout.NORTH);
        home.add(txt,BorderLayout.CENTER);
        home.add(changeconf,BorderLayout.SOUTH);

        combo=new JComboBox<String>(s);
        combo.addActionListener(this);
        p1.setLayout(new BorderLayout());
        p1.add(combo,BorderLayout.NORTH);

        JPanel p1dole=new JPanel();
        p1dole.setLayout(new GridLayout(1,3));
        a1.setEnabled(false);
        p1dole.add(a1);
        p1dole.add(a2);
        p1dole.add(a3);
        p1.add(p1dole,BorderLayout.SOUTH);

        p2.setLayout(new BorderLayout());

        slider=new JSlider(JSlider.HORIZONTAL);
        slider.setMinimum(1000);
        slider.setMaximum(10000);

        iznos=new JLabel("1000MKD");

        iznos.setForeground(Color.BLUE);
        iznos.setText(String.valueOf("1000MKD"));

        slider.addChangeListener(new ChangeListener() {

            @Override
            public void stateChanged(ChangeEvent ce) {
           JSlider slider=(JSlider) ce.getSource();
           iznos.setText(String.valueOf(slider.getValue())+"MKD");


            }
        });

        JPanel p2dole=new JPanel();
        p2dole.setLayout(new GridLayout(1,3));

        b3.setEnabled(false);
        p2dole.add(b1);
        p2dole.add(b2);
      p2dole.add(b3);

      p2.add(slider,BorderLayout.NORTH);
      p2.add(iznos,BorderLayout.CENTER);
      p2.add(p2dole,BorderLayout.SOUTH);

        CardLayout crd=new CardLayout();

      crd.addLayoutComponent(home,"Home");
         crd.addLayoutComponent(p1,"LapTop");
       crd.addLayoutComponent(p2,"Slide");
      main=new JPanel(crd);

      a2.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {
                CardLayout crd=(CardLayout) main.getLayout();
                crd.show(main,"Home");


            }
        });

      a3.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {

                 CardLayout crd=(CardLayout) main.getLayout();
                crd.next(main);

            }
        });

      b1.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {

                 CardLayout crd=(CardLayout) main.getLayout();
                 crd.previous(main);

            }
        });


       b2.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {

                 CardLayout crd=(CardLayout) main.getLayout();
                 crd.show(main,"Home");

            }
        });

       changeconf.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {

                 CardLayout crd=(CardLayout) main.getLayout();
                 crd.show(main,"LapTop");

            }
        });

      main.add(home);
       main.add(p1);
       main.add(p2);

       this.getContentPane().add(main);



    }


    public static void main(String[] args) {
       Piramidalna p=new Piramidalna();
       p.setVisible(true);


    }

    @Override
    public void actionPerformed(ActionEvent ae) {

        int sum=0;
        String s="";
        sum+=slider.getValue();
        s+=combo.getSelectedItem().toString()+"\n";

            if(combo.getSelectedItem().toString().equals("ASUS")){
                sum+=11250;

            }
        txt.setText(s);
        conf.setText(String.format("Your configuration costs %d",sum));

    }
}