Thread: i'm not sure whats wrong with the code for my button could someone help me with this

import static javax.swing.JOptionPane.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.*;
import java.text.DecimalFormat;
 
public class ticket extends JFrame implements ActionListener {
 
	static final double SINGLE = 1.40;
	static final double RETURN = 2.40;
	static final double ZONE_A = 3.80;
	static final double ZONE_A_B = 5.50;
 
	  DecimalFormat pounds = new DecimalFormat("£0.00");
	String id;
	 JTextField ticket = new JTextField(5);
	JTextField stp = new JTextField(5);
	int amount = 0; 
	JTextField change = new JTextField(5);
	JTextField paid = new JTextField(5);
	JButton ten = new JButton("10p");
	JButton twenty = new JButton("20p");
	JButton fifty = new JButton("50p");
	JButton pound = new JButton("£1");
	JButton two = new JButton("£2");
	JButton five = new JButton("£5");
	JButton tenp = new JButton("£10");
	JButton twentyp = new JButton("£20");
	JButton cancel = new JButton("Cancel");
	JRadioButton single = new JRadioButton("single (£1.40)",true);
	JRadioButton Return = new JRadioButton("return (£2.40)",true);
	JRadioButton zoneA = new JRadioButton("Zone A (£3.80)",true);
	JRadioButton zoneAB = new JRadioButton("Zone A B (£5.50)",true);
	ButtonGroup type =new ButtonGroup();
	// The spinner gives values from 1 to 10.
	// Spinners allow safe entry of a number in a range.
	 JSpinner numtick = new JSpinner(new SpinnerNumberModel(1, 0, 10, 1));
	 int stpno = 0;
	 private int size = 0;
 
 
	public static void main(String[] args)
	{
		new ticket();
	}
	public ticket()
	{
		  setLayout(new BorderLayout());
         setSize(700, 150);
         setTitle("Redwich Trams - Ticket Machine");
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         JPanel top = new JPanel();
         top.setLayout(new FlowLayout());
         top.add(new JLabel("Ticket Type:   "));
 
		 type.add(single);
		 type.add(Return);
		 type.add(zoneA);
		 type.add(zoneAB);
		 top.add(single);
		 top.add(Return);
		 top.add(zoneA);
		 top.add(zoneAB);
		 top.add(new JLabel("  Tickets"));
		 top.add(numtick);
		 single.addActionListener(this);
		 Return.addActionListener(this);
		 zoneA.addActionListener(this);
		 zoneAB.addActionListener(this);
 
		add("North", top);
		 setVisible(true);
 
		 JPanel middle = new JPanel();
         middle.setLayout(new FlowLayout());
		 middle.add(new JLabel("Ticket Type:   "));
		setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
		 middle.add(ten);
		 middle.add(twenty);
		 middle.add(fifty);
		 middle.add(pound);
		 middle.add(two);
		 middle.add(five);
		 middle.add(tenp);
		 middle.add(twentyp);
		 middle.add(cancel);
		 ten.addActionListener(this);
		 twenty.addActionListener(this);
		 fifty.addActionListener(this);
		 pound.addActionListener(this);
		 two.addActionListener(this);
		 five.addActionListener(this);
		 tenp.addActionListener(this);
		 twentyp.addActionListener(this);
		 cancel.addActionListener(this);
 
		 add("Center", middle);
		 setVisible(true);
 
		 JPanel bottom = new JPanel();
         bottom.setLayout(new FlowLayout());
         bottom.add(new JLabel("   Ticket Cost:"));
		 bottom.add(ticket);
         bottom.add(new JLabel("   Amount Paid:"));
         bottom.add(paid);
         bottom.add(new JLabel("   Amount Still To Pay:"));
         bottom.add(stp); 
		 stp.setEditable(false);
		 bottom.add(new JLabel("   Change:"));
         bottom.add(change);
		 ticket.setEditable(false);
		 paid.setEditable(false);
 
		 change.setEditable(false);
         ticket.setText("£0.00");
		 stp.setText("£0.00");
		 change.setText("£0.00");
		 paid.setText("£0.00");
 
		 add("South", bottom);
		 setVisible(true);
	}
		  public void actionPerformed(ActionEvent e){
	{
			  if (e.getSource() == ten)
			  paid= paid + 10;
			  amount =amount - 10;
			  if (ticket<paid)
			  {
				  change=ticket-paid;
				  }
 
		  if (e.getSource() == twenty)
			  paid=paid+20;
			  amount =amount - 20;
			  if (ticket<paid)
			  {
				  change=ticket-paid;
				  }
 
	  if (e.getSource() == fifty)
			  paid=paid+50;
			  amount =amount - 50;
			  if (ticket<paid)
			  {
				  change=ticket-paid;
				  }
 
				    if (e.getSource() == pound)
			  paid=paid+100;
			  amount =amount - 100;
			  if (ticket<paid)
			  {
				  change=ticket-paid;
				  }
 
				    if (e.getSource() == two)
			  paid=paid+200;
			  amount =amount - 200;
			  if (ticket<paid)
			  {
				  change=ticket-paid;
				  }
 
				    if (e.getSource() == five)
			  paid=paid+500;
			  amount =amount - 500;
			  if (ticket<paid)
			  {
				  change=ticket-paid;
				  }
 
		  if (e.getSource() == tenp)
			  paid=paid+1000;
			  amount =amount - 1000;
			  if (ticket<paid)
			  {
				  change=ticket-paid;
				  }
 
		  if (e.getSource() == twentyp)
			  paid=paid+2000;
			  amount =amount - 2000;
			  if (ticket<paid)
			  {
				  change=ticket-paid;
				  }
	}
 
	{
double tp = 0;
	  int noticket = Integer.parseInt(""+numtick.getValue());
      if (single.isSelected()) tp = 1.40; 
		{
		  ticket.setText(pounds.format(tp));
		  stp.setText(pounds.format(tp));
 
			  }
 
		if (Return.isSelected()) tp = 2.40;
			{
 
          ticket.setText(pounds.format(tp));
		  stp.setText(pounds.format(tp));
			}
 
	 if (zoneA.isSelected()) tp = 3.80;
			  {
			ticket.setText(pounds.format(tp));
			stp.setText(pounds.format(tp));
		     }
 
		 if (zoneAB.isSelected()) tp = 5.50; 
			  {
			ticket.setText(pounds.format(tp));
			stp.setText(pounds.format(tp));
			  }
		{
	if (e.getSource() == cancel);
 
	 ticket.setText("£0.00");
	   stp.setText("£0.00");
	  change.setText("£0.00");
	  paid.setText("£0.00"); 
		 }
 
        }
		  }
 }

i'm not sure why my button code is not working it looks fine to me but theres errors with it can someone help me out?

button code is not working

Please explain and post any error messages.