java 动态的给树添加新节点 望高手指点啊

//先选中节点才能增加节点

import javaawt;

import javaawtevent;

import javaxswing;

import javaxswingevent;

import javaxswingtree;

public class TreeTest implements ActionListener,TreeModelListener{

JLabel label=null;

JTree tree=null;

DefaultTreeModel treeModel=null;

String nodeName=null;//原有节点名称

public TreeTest(){

JFrame f=new JFrame("TreeTest");

Container contentPane=fgetContentPane();

DefaultMutableTreeNode root=new DefaultMutableTreeNode("资源管理器");

tree=new JTree(root);

treesetEditable(true);

treeaddMouseListener(new MouseHandle());

treeModel=(DefaultTreeModel)treegetModel();

treeModeladdTreeModelListener(this);

JScrollPane scrollPane=new JScrollPane();

scrollPanesetViewportView(tree);

JPanel panel=new JPanel();

JButton b=new JButton("新增节点");

baddActionListener(this);

paneladd(b);

b=new JButton("删除节点");

baddActionListener(this);

paneladd(b);

b=new JButton("清除所有节点");

baddActionListener(this);

paneladd(b);

label=new JLabel("Action");

contentPaneadd(panel,BorderLayoutNORTH);

contentPaneadd(scrollPane,BorderLayoutCENTER);

contentPaneadd(label,BorderLayoutSOUTH);

fpack();

fsetVisible(true);

faddWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

Systemexit(0);

}

});

}

//本方法运行新增、删除、清除所有节点的程序代码

public void actionPerformed(ActionEvent ae){

if (aegetActionCommand()equals("新增节点")){

DefaultMutableTreeNode parentNode=null;

DefaultMutableTreeNode newNode=new DefaultMutableTreeNode("新节点");

newNodesetAllowsChildren(true);

TreePath parentPath=treegetSelectionPath();

//取得新节点的父节点

parentNode=(DefaultMutableTreeNode)(parentPathgetLastPathComponent());

//由DefaultTreeModel的insertNodeInto（）方法增加新节点

treeModelinsertNodeInto(newNode,parentNode,parentNodegetChildCount());

//tree的scrollPathToVisible()方法在使Tree会自动展开文件夹以便显示所加入的新节点。若没加这行则加入的新节点

//会被 包在文件夹中，你必须自行展开文件夹才看得到。

treescrollPathToVisible(new TreePath(newNodegetPath()));

labelsetText("新增节点成功");

}

if (aegetActionCommand()equals("删除节点")){

TreePath treepath=treegetSelectionPath();

if (treepath!=null){

//下面两行取得选取节点的父节点

DefaultMutableTreeNode selectionNode=(DefaultMutableTreeNode)treepathgetLastPathComponent();

TreeNode parent=(TreeNode)selectionNodegetParent();

if (parent!=null) {

//由DefaultTreeModel的removeNodeFromParent()方法删除节点，包含它的子节点。

treeModelremoveNodeFromParent(selectionNode);

labelsetText("删除节点成功");

}

}

}

if (aegetActionCommand()equals("清除所有节点")){

//下面一行，由DefaultTreeModel的getRoot()方法取得根节点

DefaultMutableTreeNode rootNode=(DefaultMutableTreeNode)treeModelgetRoot();

//下面一行删除所有子节点

rootNoderemoveAllChildren();

//删除完后务必运行DefaultTreeModel的reload() *** 作，整个Tree的节点才会真正被删除

treeModelreload();

labelsetText("清除所有节点成功");

}

}

public void treeNodesChanged(TreeModelEvent e){

TreePath treePath=egetTreePath();

DefaultMutableTreeNode node=(DefaultMutableTreeNode)treePathgetLastPathComponent();

try{

int[] index=egetChildIndices();

node=(DefaultMutableTreeNode)nodegetChildAt(index[0]);

}catch(NullPointerException exc){}

labelsetText(nodeName+"更改数据为:"+(String)nodegetUserObject());

}

public void treeNodesInserted(TreeModelEvent e){

Systemoutprintln("new node insered");

}

public void treeNodesRemoved(TreeModelEvent e){

Systemoutprintln("node deleted");

}

public void treeStructureChanged(TreeModelEvent e){

Systemoutprintln("Structrue changed");

}

public static void main(String[] args){

new TreeTest();

}

class MouseHandle extends MouseAdapter{

public void mousePressed(MouseEvent e){

try{

JTree tree=(JTree)egetSource();

int rowLocation=treegetRowForLocation(egetX(),egetY());

TreePath treepath=treegetPathForRow(rowLocation);

TreeNode treenode=(TreeNode)treepathgetLastPathComponent();

nodeName=treenodetoString();

}catch(NullPointerException ne){}

}

}

}

通过 super变量名 获取父类中的变量值

举例：

public class Parent{//定义父类Parent public int a=1;//定义父类中的一个变量a}public class Son extend Parent{//定义子类son，继承父类parent public void show(){ int b = supera;//通过super访问父类变量a，获取值赋值给b }}

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