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POJava Jlist doesn't update
 

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  1. POJava Jlist doesn't update
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    <p>I have a JList in a large gui, I cut out all other code not relevant. I can initialize the list but I can not add/remove items from it when I use a button. Everything I have read says to use a DefaultListModel. Then it will automatically update the list when you re initialize it.<br> I have also tried refocusing and repainting the panels and frame and that doesn't work either.</p> <pre><code>public static void main(String[] args) { Play worker=new Play(); worker.GUI(); } public void GUI(){ frame=new JFrame(); mainPanel=new JPanel(new GridBagLayout()); filePanel=new JPanel(new GridBagLayout()); allFilePanel=new JPanel(new GridBagLayout()); fileInputLabel=new JLabel("Enter the directory of the csv file:"); fileNameField=new JTextField(25); readFileButton=new JButton("Read File"); ReadFileButtonListener buttonListener=new ReadFileButtonListener(); readFileButton.addActionListener(buttonListener); addItem(filePanel,fileInputLabel , 0, 0, 1, 1, GridBagConstraints.CENTER); addItem(filePanel,fileNameField , 1, 0, 2, 1, GridBagConstraints.CENTER); addItem(filePanel,readFileButton , 3, 0, 1, 1, GridBagConstraints.CENTER); allFileLabel=new JLabel("List of all Data"); String [] name={"joe"}; allFileList=new JList&lt;String&gt;(name); allFileList.setVisibleRowCount(10); addItem(allFilePanel,allFileLabel , 0, 0, 1, 1, GridBagConstraints.CENTER); addItem(allFilePanel,allFileList , 0, 1, 1, 1, GridBagConstraints.CENTER); addItem(mainPanel, filePanel, 0, 0, 4, 1, GridBagConstraints.CENTER); addItem(mainPanel, allFilePanel, 1, 2, 1, 1, GridBagConstraints.CENTER); frame.setSize(1000,800); frame.add(mainPanel); frame.setVisible(true); } /**configures the panels * @param p * @param c * @param x * @param y * @param width * @param height * @param align */ private void addItem(JPanel p,JComponent c, int x, int y , int width,int height, int align){ GridBagConstraints gc=new GridBagConstraints(); gc.gridx=x; gc.gridy=y; gc.gridwidth=width; gc.gridheight=height; gc.weightx=100; gc.weighty=100; gc.insets=new Insets(5,5,5,5); gc.fill=GridBagConstraints.NONE; p.add(c,gc); } private class ReadFileButtonListener implements ActionListener{ @Override public void actionPerformed(ActionEvent arg0) { generateAllFileList(); } } public void generateAllFileList(){ DefaultListModel&lt;String&gt; list=new DefaultListModel&lt;String&gt;(); list.addElement("Fred"); allFileList=new JList&lt;String&gt;(list); } } </code></pre>
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