寻早JTree高手————在JTree的节点上点右键弹出菜单,解决问题马上给分！在线等
这是源码   需要做的是   右键点击在线好友和不在线的好友的子节点能弹出PopupMenu
有什么问题   马上题
public   class   FriendTree   implements   TreeSelectionListener
{
private   DefaultTreeModel   treemode;
private   String   nodenameAll;
private   DefaultMutableTreeNode   root=new   DefaultMutableTreeNode( "我的好友 ");
private   JTree   tree=new   JTree(root);

private   DefaultMutableTreeNode   online   ;
private   DefaultMutableTreeNode   notonline;
private   Client   client=new   Client();
FriendTree(Client   client)
{

this.client=client;

}
public   JTree   chushi()//未加任何好友的情况
{

treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
online   =new     DefaultMutableTreeNode( "在线的好友 ");
notonline   =new     DefaultMutableTreeNode( "不在线的好友 ");
treemode.insertNodeInto(online   ,   root,0);
treemode.insertNodeInto(notonline   ,root,1);
tree.setRowHeight(20);
tree.scrollPathToVisible(new   TreePath(notonline.getPath()));  
tree.addMouseListener(new   MouseListenerimp());
return   tree;
}

public   JTree   onlinefriend(User   user,int   id)
{
treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
for(int   i=0;i <user.getFriend().size();i++)
{
user=(User)user.getFriend().elementAt(0);
if(user.getStatus()==0)

{
System.out.println( "tree "+user.getID());//好于的ID
DefaultMutableTreeNode   newNode=new   DefaultMutableTreeNode(String.valueOf(user.getID()));
treemode.insertNodeInto(newNode   ,   online,   i);
tree.scrollPathToVisible(new   TreePath(newNode.getPath()));    
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);//只能选取一个节点
tree.addMouseListener(new   MouseListenerimp());
System.out.println( "dsfasfa ");

}
}

return   tree;
}
public   void   addonlinefriend(int   id)
{

treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
DefaultMutableTreeNode   newNode=new   DefaultMutableTreeNode(String.valueOf(id));

treemode.insertNodeInto(newNode   ,   online,   0);
tree.setRowHeight(20);

tree.scrollPathToVisible(new   TreePath(newNode.getPath()));    

tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);//只能选取一个节点
tree.setRowHeight(20);

}
public   void   addnotonlinefriend(int   id)
{

treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
DefaultMutableTreeNode   newNode=new   DefaultMutableTreeNode(String.valueOf(id));

treemode.insertNodeInto(newNode   ,   notonline,   notonline.getChildCount());

tree.scrollPathToVisible(new   TreePath(newNode.getPath()));    

tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);//只能选取一个节点

tree.setRowHeight(30);


}
public   void   liveline(User   user,int   id)
{

delNode(user,id);//首先在在线的好友节点中   删除离线的那位好友
addNode(id);//再在不在线的好友节点中   添加离线的那位好友

}
public   void   shangxian(User   user,int   id)