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POJava: Having trouble adding items to a JList from local JList
 

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  1. POJava: Having trouble adding items to a JList from local JList
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    <p>I'm having a problem here where I've created an actionListener which is intended to create a random human and add it to JList to be displayed on JScrollPane. Everything has worked out good so far except that whenever I click the JButton to add a new human, the JList does not add to the current list, instead it replaces it each time again and so only one item is ever displayed on the Jlist. I know where the problem is occurring and you'll immediately see it in the actionevent lines. Anyways, thanks for any help my friends!</p> <pre><code>private static final JTextArea PlayerList = new JTextArea(30, 100); private JList newbie; private List&lt;Human&gt; members = new ArrayList&lt;Human&gt;(); private JTextArea Area; private String[] listString; private String[] newString; private ArrayList&lt;String&gt; list = new ArrayList&lt;String&gt;(); private ArrayList&lt;String&gt; zz = new ArrayList&lt;String&gt;(); public JTabbedPaneFrame() throws FileNotFoundException { super("JTabbedPane Demo"); JTabbedPane tabbedPane = new JTabbedPane(); JPanel Gladiator = new JPanel(); getContentPane().add(Gladiator); /////////////Tabbed Pane Gladiator/////////////////// tabbedPane.addTab("Gladiator", null, Gladiator, ""); Box ListOfPlayers = Box.createVerticalBox(); ListOfPlayers.add(Box.createRigidArea(new Dimension(100,100))); ListOfPlayers.setBorder(new TitledBorder("List of Players")); Area = new JTextArea(20, 15); Area.setLineWrap(true); Area.setWrapStyleWord(false); final JList newbie = new JList(); JScrollPane PlayerViewer = new JScrollPane(newbie); PlayerViewer.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); ListOfPlayers.add(PlayerViewer); Gladiator.add(ListOfPlayers); /////////////Vertical Box between Text and Tabbed Profile////// Box Randomer = Box.createVerticalBox(); Randomer.setBorder(new TitledBorder("Randomize or Add Gladiator")); JButton AddIndividual = new JButton("Add a Player"); Randomer.add(AddIndividual); Gladiator.add(Randomer); AddIndividual.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { String x = ""; String y = ""; String z = ""; String ee = ""; ArrayList&lt;String&gt; listx = new ArrayList&lt;String&gt;(); ArrayList&lt;String&gt; zzx = new ArrayList&lt;String&gt;(); JList newbiex; Human temp; try { temp = new Human(); x = temp.toString(); y = temp.getSurname(); z = temp.getFirstName(); listx.add(x); ee = String.format(y + ", " + z ); zzx.add(ee); listString = new String[zzx.size()]; listString = zzx.toArray(listString); newbiex = new JList(zzx.toArray()); newbie.setModel(newbiex.getModel()); members.add(temp); for(String W: listString) /////testing diff method here//// { Area.append(W); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); add(tabbedPane); /////////////Action Buttons//////////////////// } } </code></pre> <p>class HumanRenderer extends DefaultListCellRenderer </p> <pre><code> { public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { JLabel label = new JLabel(); if (value != null) { Human human = (Human) value; label.setText(human.getSurname() + ", " + human.getFirstName()); } return label; } } </code></pre>
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    1. USIron
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    1. COIt would be helpful if not half of your variable names where `z`, `zz`, `zzx`, etc
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      1. POJava: Having trouble adding items to a JList from local JList
      1. USVincent van der Weele
    2. COcamelCase notation also helps a lot if you want `java` people to read your code
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      1. POJava: Having trouble adding items to a JList from local JList
      1. USDenis Tulskiy
 

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