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

public class Opgave7_5_start extends JFrame implements ActionListener {

    private JButton button1,button2,button3,butOpnieuw;
    private JTextField textField;
    private int teller=0;
    private String combinatie="";

    public static void main(String[] args) {
        Opgave7_5_start opgave7_5_start = new Opgave7_5_start();
        opgave7_5_start.setSize(300,100);
        opgave7_5_start.createGUI();
        opgave7_5_start.show();
    }

    private void createGUI() {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container window = getContentPane();
        window.setLayout(new FlowLayout());

        button1 = new JButton("1");
        window.add(button1);
        button1.addActionListener(this);

        button2 = new JButton("2");
        window.add(button2);
        button2.addActionListener(this);
        
        button3= new JButton("3");
        window.add(button3);
        button3.addActionListener(this);

        textField = new JTextField(20);
        window.add(textField);
    }

    public void actionPerformed(ActionEvent event) {
        Object source = event.getSource();
        teller++;
       
        
        //vul aan    
             
        
    }

}