如何创建带有图像的jlist

Question

我想添加一些图像到我的jlist。下面的代码工作得很好

public class MarioList {
private final Map<String, ImageIcon> imageMap;
public MarioList() {
    String[] nameList = {"Mario", "Luigi", "Bowser", "Koopa", "Princess"};
    imageMap = createImageMap(nameList);
    JList list = new JList(nameList);
    list.setCellRenderer(new MarioListRenderer());
    JScrollPane scroll = new JScrollPane(list);
    scroll.setPreferredSize(new Dimension(300, 400));
    JFrame frame = new JFrame();
    frame.add(scroll);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
}
public class MarioListRenderer extends DefaultListCellRenderer {
    Font font = new Font("helvitica", Font.BOLD, 24);
    @Override
    public Component getListCellRendererComponent(
            JList list, Object value, int index,
            boolean isSelected, boolean cellHasFocus) {
        JLabel label = (JLabel) super.getListCellRendererComponent(
                list, value, index, isSelected, cellHasFocus);
        label.setIcon(imageMap.get((String) value));
        label.setHorizontalTextPosition(JLabel.RIGHT);
        label.setFont(font);
        return label;
    }
}
private Map<String, ImageIcon> createImageMap(String[] list) {
    Map<String, ImageIcon> map = new HashMap<>();
    try {
        map.put("Mario", new ImageIcon(new URL("https://i.stack.imgur.com/NCsHu.png")));
        map.put("Luigi", new ImageIcon(new URL("https://i.stack.imgur.com/UvHN4.png")));
        map.put("Bowser", new ImageIcon(new URL("https://i.stack.imgur.com/s89ON.png")));
        map.put("Koopa", new ImageIcon(new URL("https://i.stack.imgur.com/QEK2o.png")));
        map.put("Princess", new ImageIcon(new URL("https://i.stack.imgur.com/f4T4l.png")));
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return map;
}
public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            new MarioList();
        }
    });
}
}

上面的

代码创建了一个新框架，并在其中添加了一个jscrollpane。相反，我尝试使用Netbeans手动创建框架和jcrollpane。所以不用这段代码;

JList list = new JList(nameList);
    list.setCellRenderer(new MarioListRenderer());
    JScrollPane scroll = new JScrollPane(list);
    scroll.setPreferredSize(new Dimension(300, 400));
    JFrame frame = new JFrame();
    frame.add(scroll);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);

我使用了这个代码;

jList1.add(nameList);
    jList1.setCellRenderer(new MarioListRenderer());

这里jList1是我通过Netbeans创建的jlist，它被放在jscrollpane中。但是这个代码不起作用。请告诉我得到这份工作的方法……谢谢你

Answer 1

假设您正在使用Java 7+…

jList1.add(nameList);

应该

jList1.setListData(nameList);

否则，您将需要将nameList包装在ListModel实现中