Thread: JLabel

Hello

I have a problem... I can't get my JLabel to update.. I have tried Repaint(), revaldiate(), but I think it is something wrong with my connection between my buttons and the JLabel.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
class Vindu extends JFrame{
 
	//private JTextField tekstFelt = new JTextField(20);
 
 
	String teksten = "Dette er min tekst.";
	public JLabel tekst = new JLabel(teksten);
	int valg;
 
	public Vindu(){
	}
 
	public Vindu(String tittel){
		setTitle(tittel);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setLayout(new FlowLayout());
 
		Font SS = new Font("SansSerif", Font.BOLD, 12);
		Font S = new Font("Serif", Font.BOLD, 12);
		Font M = new Font("Monospaced", Font.BOLD, 12);
		Font D = new Font("Dialog", Font.BOLD, 12);
 
 
		JButton SansSerif = new JButton("SansSerif");  // lager knappen
		SansSerif.setFont(SS);
		add(SansSerif);  // legger knappen i beholderen
 
    	JButton Serif = new JButton("Serif");
    	Serif.setFont(S);
    	add(Serif);
 
    	JButton Monospaced = new JButton("Monospaced");
    	Monospaced.setFont(M);
    	add(Monospaced);
 
    	JButton Dialog1 = new JButton("Dialog");
    	Dialog1.setFont(D);
    	add(Dialog1);
    	//pack();
 
    	Knappelytter knappelytteren = new Knappelytter(); // lager en lytter
		SansSerif.addActionListener(knappelytteren); // knytter lytteren til knappen
		Serif.addActionListener(knappelytteren);
		Monospaced.addActionListener(knappelytteren);
		Dialog1.addActionListener(knappelytteren);
 
		add(tekst);
		pack();
 
	}
}
 
 
class Knappelytter extends Vindu implements ActionListener{
  	public void actionPerformed(ActionEvent hendelse){
 
		JButton valgtKnapp = (JButton) hendelse.getSource();
		String knappeValg = valgtKnapp.getActionCommand(); // getText();
 
		String font;
		Font skrift;
		if(knappeValg.equals("SansSerif")){
			skrift = new Font("SansSerif", Font.BOLD, 20);
			tekst.setFont(skrift);
			tekst.repaint();
			tekst.revalidate();
			add(tekst);
			System.out.println(knappeValg);
			//font SansSerif
		}else if(knappeValg.equals("Serif")){
			skrift = new Font("Serif", Font.BOLD, 20);
			tekst.setFont(skrift);
			System.out.println(knappeValg);
			// font Serif
		}else if(knappeValg.equals("Monospaced")){
			skrift = new Font("Monospaced", Font.BOLD, 20);
			tekst.setFont(skrift);
			System.out.println(knappeValg);
			// font Monospaced
		}else if(knappeValg.equals("Dialog")){
			skrift = new Font("Dialog", Font.BOLD, 20);
			tekst.setFont(skrift);
			System.out.println(knappeValg);
			// font Dialog
		}
  	}
}
 
 
 
 
class Oppgave1{
	public static void main(String[]args){
 
	Vindu etVindu = new Vindu("Et vindu med en knapp");
    	etVindu.setVisible(true);
 
	}
}

Can you explain what labels are the problem? How to you test the code to show the problem?

I figured it out