import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class MeinFrame extends JFrame{

    private JLabel jlabel;
    private JButton jButton;
    private int klicks;

    public MeinFrame() {
        setTitle("TestFrame");

        jlabel = new JLabel("Klicks: " + klicks);
        jButton = new JButton("Drück mich");

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        getContentPane().add(jlabel, BorderLayout.LINE_START);
        getContentPane().add(jButton, BorderLayout.PAGE_END);

        jButton.addActionListener(new buttonListener());

        pack();
        setVisible(true);
    }

    class buttonListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
            klicks++;
            jlabel.setText("Klicks: " + klicks);
        }
    }

    public static void main(String[] args){
        new MeinFrame();
    }
}