Untitled

package huiswerk3;import javax.swing.*;import java.awt.*;/** * * @author Martijn */public class Rekenmachine extends JFrame{    private JTextField textvak;    private JPanel knoppenpanel;    public Rekenmachine(){        knoppenpanel = new Knoppen();        textvak = new JTextField(15);        add(textvak);        add(knoppenpanel);        textvak.setText("123"); // this works         textvak.setEnabled(false);        setLayout(new FlowLayout());    }    public void setTextVak(){        String tekst = textvak.getText();        textvak.setText("blablabllalbalba"); // keeps showing 123        System.out.println(textvak.getText()); // shows blablabllalbalba        repaint();    }}