Java Problem

package de.cookieclicker;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;



public class Frame extends JFrame implements ActionListener{

	private JButton click;
	private JButton shop;

	JPanel panelCont = new JPanel();	//Panel
	JPanel panelMain = new JPanel();	//Panel
	JPanel panelShop = new JPanel();	//Panel

	CardLayout cl = new CardLayout();	//Panel

	int counter;

	public static void main(String[] args) {
		new Frame("Cookie Clicker");

	}

	@SuppressWarnings("deprecation")
	public Frame(String title) {
		super(title);

		panelCont.setLayout(cl);		//Panel

		click = new JButton("Click");
		click.setBounds(175, 300, 150, 30);
		click.addActionListener(this);
		add(click);
		panelMain.add(click);			//Panel

		shop = new JButton("Shop");
		shop.setBounds(-1, 437, 500, 25);
		shop.addActionListener(this);
		add(shop);
		panelMain.add(shop);			//Panel

		panelCont.add(panelMain, "1");	//Panel
		panelCont.add(panelShop, "2");	//Panel
		cl.show(panelCont, "1");		//Panel

		panelMain.setBackground(Color.RED);

		this.setSize(500, 500);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setLayout(null);
		this.setVisible(true);
		this.add(panelCont); 			//Panel

	}

	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == click) {
			zaehler();

		} else if (e.getSource() == shop) {
			cl.show(panelCont, "2");	//Panel
		}
	}

	public void zaehler() {
		counter++;
		System.out.println("Counter: " + counter);

	}
}