JTree问题（急）

Question

请问JTree中的结点能不能是一些具体的Swing组件(比如JCheckBox)？？
也就是说在显示界面的时候各个结点是自定义的Swing组件,用户可以根据Swing组件进行除JTree之外的操作。
请帮忙给出个例子。。

Answer 1

可以，jtree的每个节点都有自己的绘制器和编辑器，编辑器可以作出你想要得节点

Answer 2

/*
 * FileViewer.java
 *
 * Created on 2005年5月8日, 上午10:46
 */package test.tree;
import java.io.File;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;/**
 *
 * @author yanl
 */
public class FileViewer extends JFrame{
    private static String metalClassName = "lambert.swing.plaf.jupiter.JupiterLookAndFeel";
    /** Creates a new instance of FileViewer */
    public FileViewer() {
//        try {
//            UIManager.setLookAndFeel(metalClassName);
//            SwingUtilities.updateComponentTreeUI(this);
//            pack();
//        } catch (UnsupportedLookAndFeelException exc) {
//            System.out.println("UnsupportedLookAndFeelException Error:" + exc);
//        } catch (IllegalAccessException exc) {
//            System.out.println("IllegalAccessException Error:" + exc);
//        } catch (ClassNotFoundException exc) {
//            System.out.println("ClassNotFoundException Error:" + exc);
//        } catch (InstantiationException exc) {
//            System.out.println("InstantiateException Error:" + exc);
//        }
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        final JTree tree = new JTree(createTreeModel());
        JScrollPane scrollPane = new JScrollPane(tree);
        
        FileNodeRenderer renderer = new FileNodeRenderer();
        tree.setEditable(true);
        tree.setCellRenderer(renderer);
        
        getContentPane().add(scrollPane);
        
        tree.addTreeExpansionListener(new TreeExpansionListener(){
            public void treeCollapsed(TreeExpansionEvent e){
            }
            public void treeExpanded(TreeExpansionEvent e){
                TreePath path = e.getPath();
                FileNode node = (FileNode)path.getLastPathComponent();
                if(!node.isExplored()){
                    DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
                    node.explore();
                    model.nodeStructureChanged(node);
                }
            }
        });
        
        tree.addTreeSelectionListener(new TreeSelectionListener(){
            public void valueChanged(TreeSelectionEvent e){
                TreePath path = e.getNewLeadSelectionPath();
                FileNode node = (FileNode)path.getLastPathComponent();
                node.setSelected();
                if(path != null)
                    System.out.println(path);
            }
        });
    }
    
    private DefaultTreeModel createTreeModel(){
        File root = new File("E:/");
        FileNode rootNode = new FileNode(root);
        rootNode.explore();
        return new DefaultTreeModel(rootNode);
    }
    
    public static void main(String [] args){
        FileViewer f = new FileViewer();
        f.setSize(300,300);
        f.show();
    }
}class FileNode extends DefaultMutableTreeNode{
    private boolean explored = false;
    private boolean selected = false;
    public FileNode(File file){
        setUserObject(file);
    }
    public boolean getAllowsChildren() {return isDirectory();}
    public boolean isLeaf() {return !isDirectory();}
    public File getFile(){return (File)getUserObject();}
    public boolean isExplored(){return explored;}
    public boolean isDirectory(){
        File file = getFile();
        return file.isDirectory();
    }
    public boolean isSelected(){
        return selected;
    }
    public void setSelected(){
        selected = !selected;
    }
    public String toString(){
        File file = (File)getUserObject();
        String filename = file.toString();
        int index = filename.lastIndexOf("\\");
        return (index!=-1&&index!=filename.length()-1)?
            filename.substring(index+1):filename;
    }
    public void explore(){
        if(!isExplored()){
            File file = getFile();
            File [] children = file.listFiles();
            for(int i = 0;i<children.length;++i){
                add(new FileNode(children[i]));
            }
            explored = true;
        }
    }
}class FileNodeRenderer extends DefaultTreeCellRenderer{
    protected JCheckBox checkBox = new JCheckBox("Backup");
    private Component strut = Box.createHorizontalStrut(5);
    private JPanel panel = new JPanel();
    
    public FileNodeRenderer(){
        panel.setBackground(UIManager.getColor("Tree.textBackground"));
        setOpaque(false);
        checkBox.setOpaque(false);
        panel.setOpaque(false);
        panel.setLayout(new FlowLayout(FlowLayout.CENTER,0,0));
        panel.add(this);
        panel.add(strut);
        panel.add(checkBox);
    }
    
    public Component getTreeCellRendererComponent(
            JTree tree,Object value,boolean selected,
            boolean expanded,boolean leaf,int row,
            boolean hasFocus){
        FileNode node = (FileNode)value;
        super.getTreeCellRendererComponent(tree, value,selected,expanded,leaf,row, hasFocus);
        checkBox.setVisible(node.isDirectory());
        checkBox.setSelected(node.isSelected());
        return panel;
    }
}

Answer 3

这位同学，你的问题，可有在这个网站看到所有的情况，还有例子：
http://java.sun.com/docs/books/tutorial/uiswing/components/example-1dot4/
记得给我加分：
我也是小兵