我在这里遇到了一个问题,我创建了一个 actionListener,它旨在创建一个随机人类并将其添加到 JList 以显示在 JScrollPane 上。到目前为止一切都很好,除了每当我单击 JButton 添加一个新人时,JList 不会添加到当前列表中,而是每次都会再次替换它,因此 Jlist 上只显示一个项目。我知道问题出在哪里,您会立即在 actionevent 行中看到它。无论如何,感谢任何帮助我的朋友!
private static final JTextArea PlayerList = new JTextArea(30, 100);
private JList newbie;
private List<Human> members = new ArrayList<Human>();
private JTextArea Area;
private String[] listString;
private String[] newString;
private ArrayList<String> list = new ArrayList<String>();
private ArrayList<String> zz = new ArrayList<String>();
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<String> listx = new ArrayList<String>();
ArrayList<String> zzx = new ArrayList<String>();
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////////////////////
}
}
HumanRenderer 类扩展 DefaultListCellRenderer
{
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;
}
}