Thread: Repressable button in GUI

This class shows a GUI with a JLabel, a JButton and a JTextField. When klicking the button, an array of Strings in another class randomizes a String from the array and adds it to the textfield in this class. This works fine.

But I want the button to be repressable. I want the button to get a new randomized String from the array when I press it again, without restarting the program. How do I do?

import com.sun.j3d.utils.behaviors.vp.WandViewBehavior.ResetViewListener;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
 
 
public class p12NameGenGUI extends JFrame implements ActionListener
{
 
    p12NamnLista randomp12Namn = new p12NamnLista();
    JButton knapp;
    JLabel textTK;
    JTextField visaNamn;
 
    public p12NameGenGUI()
    {
        textTK = new JLabel("Tryck på knappen för ett slumpat P12 namn!");
        textTK.setForeground(Color.red);
        knapp = new JButton("TRYCK NU");
 
        visaNamn = new JTextField();
        visaNamn.setColumns(10);
 
        this.add(textTK);
        this.add(knapp);
        knapp.addActionListener(this);
        this.add(visaNamn);
 
 
    }
 
 
    public static void main(String[] args)
    {
 
 
        p12NameGenGUI p = new p12NameGenGUI();
        p.setSize(300, 300);
        p.setLocation(200, 300);
        p.setDefaultCloseOperation(EXIT_ON_CLOSE);
        p.setLayout(new FlowLayout());
        p.setVisible(true);
    }
 
    public void actionPerformed(ActionEvent e)
    {
 
        visaNamn.setText(randomp12Namn.toString());
 
    }
}//class end

How is the button not "repressable"? What happens when you press it again?

When posting code, make sure you use the code or highlight tags. I did it for you this time, but please be more mindful in the future.