关于JTREE的问题~~~~~~~~~
在删除树的节点的时候老是出问题!!!!!!!!!
代码如下:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
class JTreeTest extends JFrame
{
Container cn;


JPopupMenu jpm=new JPopupMenu();

JPopupMenu jpm1=new JPopupMenu();

JMenu jm=new JMenu( "编辑 ");
JMenuItem jmi1=new JMenuItem( "编辑 ");
JMenuItem jmi2=new JMenuItem( "删除 ");
JMenuItem jmi3=new JMenuItem( "退出 ");



JMenuItem jmi4=new JMenuItem( "锁定 ");
JMenuItem jmi5=new JMenuItem( "解锁 ");




DefaultMutableTreeNode root=new DefaultMutableTreeNode( "JTree ");

DefaultMutableTreeNode colors=new DefaultMutableTreeNode( "colors ");

DefaultMutableTreeNode sports=new DefaultMutableTreeNode( "sports ");

DefaultMutableTreeNode basketball=new DefaultMutableTreeNode( "basketball ");
DefaultMutableTreeNode football=new DefaultMutableTreeNode( "football ");
DefaultMutableTreeNode hockey=new DefaultMutableTreeNode( "hockey ");

DefaultMutableTreeNode food=new DefaultMutableTreeNode( "food ");

DefaultMutableTreeNode hotdog=new DefaultMutableTreeNode( "hotdog ");
DefaultMutableTreeNode pizza=new DefaultMutableTreeNode( "pizza ");
DefaultMutableTreeNode ravioli=new DefaultMutableTreeNode( "ravioli ");
DefaultMutableTreeNode banana=new DefaultMutableTreeNode( "banana ");

JTree tree;

JButton btn1=new JButton( "删除 ");
JButton btn2=new JButton( "退出 ");

DefaultMutableTreeNode node;
JTreeTest()
{
cn=this.getContentPane();
cn.setLayout(null);
tree=new JTree(root);
tree.setBounds(50,20,240,280);
btn2.setBounds(180,320,80,30);
btn1.setBounds(80,320,80,30);


root.add(colors);

root.add(sports);
sports.add(basketball);
sports.add(football);
sports.add(hockey);

root.add(food);
food.add(hotdog);
food.add(pizza);
food.add(ravioli);
food.add(banana);

cn.add(tree);
cn.add(btn1);
cn.add(btn2);

jpm.add(jm);
jpm.add(jmi2);
jpm.add(jmi3);


jm.add(jmi4);
jm.add(jmi5);


cn.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
cn.add(jpm);
jpm.show(cn,e.getX(),e.getY());
}
}
);
jmi3.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
}
);
jmi4.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
tree.setEnabled(false);
}
});
jmi5.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
tree.setEnabled(true);
}
});

tree.addTreeSelectionListener(new TreeSelectionListener()
{
public void valueChanged(TreeSelectionEvent e)
{
node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
System.out.println(node);
}
});

--------------------------------------btn1.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{

try
{
node.remove(node);
JOptionPane.showMessageDialog(cn, "已成功删除节点 ", "删除 ",JOptionPane.QUESTION_MESSAGE);
}
catch(Exception e1)
{
e1.printStackTrace();
}
System.out.println( "when delete node= "+node);
}
});

btn2.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
});



this.setSize(new Dimension(500,400));
this.setTitle( "节点选择 ");
this.setVisible(true);
}
public static void main(String []args)
{
JTreeTest obj=new JTreeTest();
}

}
关键的地方加了条线!!!!!!!!!!!!
难道是我的方法有问题吗?
每次在删除的时候都有一个异常-----argument is not a child
望高手解答!!!!!!!!!!!
在线等~~~~~~~~~~~

[解决办法]
node.remove(node);
哪能自己把自己给删除了,先去找到它的父节点,再
DefaultMutableTreeNode parentNode=(DefaultMutableTreeNode)node.getParent();
parentNode.remove(node);
DefaultTreeModel treeModel = (DefaultTreeModel) tree.getModel();
treeModel.reload(parentNode);
tree.repaint();