急:如何实现一个JTree中的结点点击后，调用不同不同的panal

Question

如上！最好有代码解释

Answer 1

    建立一个JPanel，定义它的布局为CardLayout，将其它需要调用的panel添加到该面板中，注意添加的时候使用add(panel1,"card1"），这样card1就代表panel1。然后给jtree添加事件。如下：private void jTree1ValueChanged(javax.swing.event.TreeSelectionEvent evt) {                                    
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)jTree1.getLastSelectedPathComponent();
        if(node.toString().equals("1")) {
           ((CardLayout)cardPanel.getLayout()).show(cardPanel, "card1");
           cardPanel.validate();
        }
        else if(node.toString().equals("2")){
             
                  ((CardLayout)cardPanel.getLayout()).show(cardPanel, "card2");
                  cardPanel.validate();
             
        }
        else if(node.toString().equals("3")){
            
                ((CardLayout)cardPanel.getLayout()).show(cardPanel, "card3");
                cardPanel.validate();
           
        }
    }  

Answer 2

先定义一个 XXXNode.getPanel();listener = new TreeSelectionListener(){
public void valueChanged(TreeSelectionEvent e){
     DefaultMutableTreeNode   node   =   (DefaultMutableTreeNode)e.getPath.getLastSelectedPathComponent(); 
     ((XXXNode)node.getUserObject()).getPanel().show();
}
theTree.addTreeSelectionListener(listerner);