setting something disposed or invisible java

changed the project since its working now. kinda. the image still isnt changing.

package icnon;

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

public class FrameIconExample extends JFrame implements ActionListener {

    JLabel j;
    JPanel p, l, k;
    JButton picOne, picTwo;
    Container cPane;

    public FrameIconExample() {
        JButton picOne = new JButton("picOne");
        JButton picTwo = new JButton("picTwo");
        picOne.setName("picOne");
        picTwo.setName("picTwo");

        picOne.addActionListener(this);
        picTwo.addActionListener(this);

        p = new JPanel(new GridLayout(2, 1));
        l = new JPanel(new FlowLayout());
        k = new JPanel(new FlowLayout());

        cPane = getContentPane();

        j = new JLabel(new ImageIcon(
            "../meet/src/images/beautiful-closeup-portrait-photography.jpg"));

        l.add(j);
        k.add(picOne);
        k.add(picTwo);
        p.add(l);
        p.add(k);

        add(p);
    }

    public static void main(String[] args) {
        FrameIconExample frame = new FrameIconExample();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setSize(new Dimension(300, 800));
        frame.setTitle("Frame Icon Example");

        // Display the form
        frame.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        JButton temp = (JButton) e.getSource();
        String src =开发者_运维百科 "../meet/src/images/Majken Kruse portrait - john.jpg";

        //System.out.println(src + " " + temp.getName());

        if (temp.getName().equalsIgnoreCase("picOne")) {
            try {

                l.hide();

                try {

                    src = "../meet/src/images/beautiful-closeup-portrait-photography.jpg";
                    System.out.println(src + " " + temp.getName());
                    Icon img;
                    j = new JLabel(new ImageIcon(src));

                    l.add(j);

                    System.out.println("1");
                } catch (Exception q) {
                    q.printStackTrace();
                }

                if (temp.getName().equalsIgnoreCase("picTwo")) {
                    src = "../icontest/images/Majken Kruse portrait - john.jpg";
                    System.out.println(src + " " + temp.getName());
                    Icon img;
                    j = new JLabel(new ImageIcon(src));
                    l.add(j);
                    System.out.println("2");
                }
            } catch (Exception x) {
                x.printStackTrace();
            }
        }
    }
}

excuse the bad indentation. im pretty sure the method l.add(j); is the reason the image doesnt change.

any ideas what it should be?

Note: this answer was made for the revisions 1 and 2 of the question.

It's not an Awt error, it's a NullPointerException.

Your field l is null, because on the moment you thought you created it, you actually masked it with a local variable.

JPanel p = new JPanel(new GridLayout(2, 1));
JPanel l = new JPanel(new FlowLayout());
JPanel k = new JPanel(new FlowLayout());

Should be:

p = new JPanel(new GridLayout(2, 1));
l = new JPanel(new FlowLayout());
k = new JPanel(new FlowLayout());

Read again the error, with the stack trace. It tells you which line is the problem, and the type of the error tells you what happened, in this case.

The problem you are having is that you declare a global JPanel named l, but then when you instantiate JPanels in your constructor, you declare and assign a local scope JPanel named l. When you try to add a component in your actionPerformed, you are attempting to add it to the null global var.

I assume you did not set the correct image location. Are you sure the images are in the exact location you specified? What IDE are you using? If you use Eclipse, a refresh of your project might help.