public class BusPayment extends JFrame{
private JButton paynow;
private JButton cancel;
private JComboBox<String> jComboBox1;
private JFrame frame;
private JLabel label1, label2, label3, label4;
private JPanel panel1, panel2,panel3;
private JRadioButton destination1;
private JRadioButton destination2;
private JRadioButton destination3;
private JRadioButton destination4;
private JRadioButton destination5;
private JRadioButton destination6;
private JComboBox company;
private JTextField passengerstextfield;

public BusPayment (){

    frame.setTitle("Express Bus Ticketing Management System");
    frame.setSize(1400,700);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
    buildPanel();
    panel1.add(label1);
    panel2.add(label2);
    panel2.add(passengerstextfield);
    panel2.add(label3);
    panel2.add(company);
    panel3.add(destination1);
    panel3.add(destination2);
    panel3.add(destination3);
    panel3.add(destination4);
    panel3.add(destination5);
    panel3.add(destination6);
    panel3.add(paynow);
    panel3.add(cancel);

}

private void buildPanel(){

    panel1 =new JPanel();
    label1=new JLabel("Welcome to the Express Bus Ticketing System! ");

    panel2=new JPanel();
    label2=new JLabel("Number of Passenger(s): ");
    passengerstextfield=new JTextField(8);

    label3=new JLabel("Selected Bus Company: ");
    final JComboBox<String> comp = new JComboBox<>(new String[] {"Company1", "Company2", "Company3", "Company4"});

    panel3=new JPanel();
    label4=new JLabel("Select a ticket: ");

    destination1=new JRadioButton ("Destination 1 RM15");
    JRadioButton des1 = new JRadioButton(Double.toString(15));
    des1.setSelected(true);   
    des1.add(des1);

    destination2=new JRadioButton ("Destination 2 RM18");
    JRadioButton des2 = new JRadioButton(Double.toString(18));
    des2.setSelected(true);    
    des2.add(des2);

    destination3=new JRadioButton ("Destination 3 RM15");
    JRadioButton des3 = new JRadioButton(Double.toString(15));
    des3.setSelected(true);    
    des3.add(des3);

    destination4=new JRadioButton ("Destination 4 RM12");
    JRadioButton des4 = new JRadioButton(Double.toString(12));
    des4.setSelected(true);    
    des4.add(des4);

    destination5=new JRadioButton ("Destination 5 RM16");
    JRadioButton des5 = new JRadioButton(Double.toString(16));
    des5.setSelected(true);   
    des5.add(des5);

    destination6=new JRadioButton ("Destination 6 RM13");
    JRadioButton des6 = new JRadioButton(Double.toString(13));
    des6.setSelected(true);   
    des6.add(des6);

    paynow=new JButton ("Proceed");
    paynow.addActionListener(new PayNowListener());
    cancel=new JButton ("Cancel");
    cancel.addActionListener(new CancelListener());

    panel1.add(label1);
    panel2.add(label2);
    panel2.add(passengerstextfield);
    panel2.add(label3);
    panel2.add(comp);
    panel3.add(des1);
    panel3.add(des2);
    panel3.add(des3);
    panel3.add(des4);
    panel3.add(des5);
    panel3.add(des6);
    panel3.add(paynow);
    panel3.add(cancel);

}

private void destination1ActionPerformed(ActionEvent e) {                                              
  String price = e.getActionCommand();
  System.out.println("Selected ticket price = RM " +  price);   
}                                             

private void destination2ActionPerformed(ActionEvent e) {                                              
  String price = e.getActionCommand();
  System.out.println("Selected ticket price ...