我想創建一個自定義ListCellRenderer,以便在每行中給予不同的前景色,具體取決於jList的輸入。我不是專家或任何東西,但我真的不知道這一點。Java自定義ListCellRenderer投射問題(包括SSCCE)
我得到一個鑄造錯誤:在線程「主要」 java.lang.ClassCastException
異常:java.lang.String中不能轉換到app.CustomObject
感謝您的時間。
這裏是SSCCE:
import java.awt.Color;
import java.awt.Component;
import javax.swing.DefaultListCellRenderer;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.ListSelectionModel;
public class MyListCellRenderer extends DefaultListCellRenderer
{
static Color color;
static ListSelectionModel listSelectionModel;
static JList jList1;
static DefaultListModel listModel = new DefaultListModel();
static JFrame frame;
@Override
public Component getListCellRendererComponent(JList list,
Object value, int index, boolean isSelected,
boolean cellHasFocus)
{
super.getListCellRendererComponent(list,
value,
index,
isSelected,
cellHasFocus);
if (value != null)
{
CustomObject o = (CustomObject) value;
setText(o.getData());
setForeground(o.getColor());
}
return this;
}
public static void main(String[] args)
{
jList1 = new javax.swing.JList();
listSelectionModel = jList1.getSelectionModel();
listSelectionModel.addListSelectionListener(
new app.ListSelectionHandler());
jList1.setCellRenderer(new app.MyListRenderer());
jList1.setModel(listModel);
listModel.addElement("Option1");
frame = new JFrame();
frame.add(jList1);
frame.pack();
frame.setVisible(true);
}
}
class CustomObject
{
String s;
Color color;
public CustomObject(Color color, String s)
{
this.s = s;
this.color = color;
}
public Color getColor()
{
return color;
}
public String getData()
{
return s;
}
@Override
public String toString()
{
return s + color.getRGB();
}
}
我不認爲這個代碼是自包含的。 – 2010-06-24 06:59:23
我很確定它是:P – kxk 2010-06-25 17:40:27