JAVA JTree的使用__java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;




/**
 * 一個JTree的維護代碼。重點在
 * 1）擷取選擇節點的方式
 * 2）在JTree中增加Jpopmenu的方式
 * 3）刪除節點
 * 4）修改節點
 * @author miao
 *
 */
public class ShowTree extends JTree {
public ShowTree(String rootName)
{
super();
setEditable(true);   
DefaultMutableTreeNode node = new DefaultMutableTreeNode(rootName);
DefaultTreeModel treeModel = new DefaultTreeModel(node);
setModel(treeModel);

AddPopMenu();

}

/**
* 增加資料樹的節點
* @param strSubNode
*/
public void AddTree(String strSubNode)
{
String inputStr = JOptionPane.showInputDialog("請輸入節點名稱");
if (inputStr.length()>0)
{
strSubNode = inputStr;
}

DefaultMutableTreeNode node = (DefaultMutableTreeNode)getLastSelectedPathComponent();

DefaultMutableTreeNode subNode = new DefaultMutableTreeNode(strSubNode);
node.add(subNode);
updateUI();
}

public void AddPopMenu()
{
JPopupMenu popupMenu = new JPopupMenu();
JMenuItem item = new JMenuItem("增加");

item.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
AddTree("newSubNode");
}
});
popupMenu.add(item);

item = new JMenuItem("刪除");
item.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
DelTree();
}
});
popupMenu.add(item);

item = new JMenuItem("修改");
item.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
EditTree();
}
});
popupMenu.add(item);

setComponentPopupMenu(popupMenu);
}

/**
* 只有輸入斷行符號才能修改樹形結構的節點值
*/
private void EditTree()
{
startEditingAtPath(getSelectionPath());
}

public void DelTree()
{
int option = JOptionPane.showConfirmDialog(null, "確定要刪除該節點嗎。");
if(option==0)
{
System.out.println(option);
DefaultMutableTreeNode node = (DefaultMutableTreeNode)getLastSelectedPathComponent();
node.removeFromParent();
updateUI();
}
}

public static void main(String[] args)
{
ShowTree showTree = new ShowTree("this is root");
JFrame jFrame = new JFrame();
jFrame.getContentPane().add(showTree);
SwingConsole.run(jFrame,0, 0);
}

}