JTree的问题请教!

Question

问个问题！
JTree中结点字体颜色能不能自己设定
我想做个带有颜色提示的树，如果实在不行，能不能更换结点前面的图标！

Answer 1

ImageIcon leafIcon = createImageIcon("images/middle.gif");
if (leafIcon != null) {
    DefaultTreeCellRenderer renderer = 
new DefaultTreeCellRenderer();
    renderer.setLeafIcon(leafIcon);
    tree.setCellRenderer(renderer);
}这样就可以了设置图案了DefaultTreeCellRenderer参考这个类 API

Answer 2

这样的话你就应该创建一个TreeCellRender的实现类自己自定义你的需求

Answer 3

jTree1.setCellRenderer(new DefaultTreeCellRenderer(){
      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);
        if(leaf)
        {
          System.out.println(value.toString());
          setTextNonSelectionColor(getColor(value));
        }
        
        return this;
      }
    });  protected Color getColor(Object value) {
    Color tColor;
    if (value.toString().equals("男")) 
    {
      tColor = Color.red;
    }
    else 
    {
        tColor = Color.blue;
    }
    return tColor;
  }这个存在问题:
1、通过输出System.out.println(value.toString());来看，怎么不是遍历一遍呢
2、setTextNonSelectionColor(getColor(value));颜色设置怎么不对在线等带高手帮助！！！！

Answer 4

package pkg;import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
public class CellRender extends DefaultTreeCellRenderer implements TreeCellRenderer {
    protected Color selectedBackground;
    protected Color selectedForeground;
    protected Color noselectedBackground;
    protected Color noselectedForeground;
    protected Color overflowBackground = Color.yellow;
    protected Color overflowForeground = Color.red;
    protected Color overflowSelectedBG = Color.green;
    protected Color overflowSelectedFG = Color.black;
    public CellRender()
    {
        super();
    }
//重载getTreeCellRendererComponent方法
  public Component getTreeCellRendererComponent(JTree tree,Object value,boolean selected,boolean expanded,boolean   leaf,int row,boolean hasFocus) 
    {
      if (value==null || row<0)return this;
      DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
      Node nd = (Node) node.getUserObject();
      if (nd.name.equals("6")) 
      {
        if (selected) {
          this.setForeground(Color.red);
        }
        else {
          this.setForeground(Color.red);
        }
      }
      else 
      {
        if (selected) {
          this.setForeground(Color.red);
        }
        else {
          this.setForeground(Color.green);
        }
      }
      //this.firePropertyChange("leafIcon",this.getLeafIcon(),new ImageIcon("c:\\leaf.gif"));
      this.setLeafIcon(new ImageIcon("c:\\leaf.gif"));
      this.setOpenIcon(new ImageIcon("c:\\open.gif"));
      this.setClosedIcon(new ImageIcon("c:\\close.gif"));
      this.setFont(new Font("Dialog",0,18));
      this.setBackground(Color.black);
      return this;
    }} 
在另一个程序中调用该类:
jTree1.setCellRenderer(new CellRender());
怎么有些属性能改变,比如:
this.setFont(new Font("Dialog",0,18));有些属性怎么不能改变,比如:
this.setLeafIcon(new ImageIcon(".\\pic\\leaf.gif"));
this.setOpenIcon(new ImageIcon(".\\pic\\leaf.gif"));
this.setClosedIcon(new ImageIcon(".\\pic\\leaf.gif"));
以及:
this.setBackgroud(Color.blue);为什么呢?