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

public class EinButton extends JFrame
{
    private JButton button1;
    private JPanel panelButton;
    private JLabel oben;
    private JLabel anzeige;

    public EinButton()
    {
        super("Ein Button");
        setLocation(300, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        getContentPane().setLayout(new BorderLayout(10, 10));

        button1 = new JButton("Button 1");

       panelButton = new JPanel();
       panelButton.add(button1);

       oben = new JLabel("Mit einem Button");
       oben.setHorizontalAlignment(JLabel.CENTER);

       anzeige = new JLabel("Bitte den Button klicken");

       getContentPane().add(BorderLayout.NORTH, oben);
       getContentPane().add(anzeige);

       getContentPane().add(BorderLayout.WEST, panelButton);
       pack();
       setVisible(true);
    }

    private void eingabe(String a) {
        anzeige.setText(a);
    }
}