我有一个JTree和它的节点从DefaultMutableTreeNode驱动。 每个节点都可以被验证或not.At首先节点的图标都是一样的，但是，我要改变验证节点的图标时我选择它们，然后按确认按钮。 我想有点击和写在每个节点上，所以我不能用JLabel的显示图标的能力 。 我作了如下的代码，但它返回NULLException。
class CustomIconRenderer extends DefaultTreeCellRenderer {
ImageIcon defaultIcon;
ImageIcon specialIcon;
ImageIcon closeIcon;
static DefaultTreeModel model;
static myDefaultMutableTreeNode root;
public CustomIconRenderer()
{
openIcon = new ImageIcon(CustomIconRenderer.class.getResource("icons/question.png"));
closeIcon = new ImageIcon(CustomIconRenderer.class.getResource("icons/Target-New-Logo.jpg"));
setLeafIcon(closeIcon);
}
@Override
public Component getTreeCellRendererComponent(JTree tree,Object value,boolean sel,boolean expanded,boolean leaf,int row,boolean hasFocus)
{
super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
Object nodeObj = ((DefaultMutableTreeNode)value).getUserObject();
Check_each_nodes_are_verified_change_the_icon();
return this;
}
}
public class myDefaultMutableTreeNode extends DefaultMutableTreeNode{
private static int id=0;
private int nodeid;
private int verify;
private int depth;
}
数以百万计感谢。
