返回信息流以下代码，运行之后有好几个node，请问它是在哪里加上这些node的呢？
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
public class Test extends JFrame implements MouseListener,ActionListener {
private static final long serialVersionUID = 1L;
JTree tree;
JPopupMenu popMenu;
JMenuItem addItem;
JMenuItem delItem;
JMenuItem editItem;
public Test() {
tree = new JTree();
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.addMouseListener(this);
tree.setCellEditor(new DefaultTreeCellEditor(tree, new DefaultTreeCellRenderer()));
getContentPane().add(tree);
setSize(200, 200);
popMenu = new JPopupMenu();
addItem = new JMenuItem("添加");
addItem.addActionListener(this);
delItem = new JMenuItem("删除");
delItem.addActionListener(this);
editItem = new JMenuItem("修改");
editItem.addActionListener(this);
popMenu.add(addItem);
popMenu.add(delItem);
popMenu.add(editItem);
getContentPane().add(new JScrollPane(tree));
}
public void mouseClicked(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
TreePath path = tree.getPathForLocation(e.getX(), e.getY()); // 关键是这个方法的使用
if (path == null) {
return;
}
tree.setSelectionPath(path);
if (e.getButton() == 3) {
popMenu.show(tree, e.getX(), e.getY());
}
}
public void mouseReleased(MouseEvent e) {
}
public void actionPerformed(ActionEvent e) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
if (e.getSource() == addItem) {
((DefaultTreeModel) tree.getModel()).insertNodeInto(new DefaultMutableTreeNode("Test"), node, node
.getChildCount());
tree.expandPath(tree.getSelectionPath());
} else if (e.getSource() == delItem) {
if (node.isRoot()) {
return;
}
((DefaultTreeModel) tree.getModel()).removeNodeFromParent(node);
} else if (e.getSource() == editItem) {
tree.startEditingAtPath(tree.getSelectionPath());
}
}
public static void main(String[] args) {
Test frame = new Test();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
这是一条镜像帖。来源：北邮人论坛 / java / #15455同步于 2010/8/6
该镜像源已超过 30 天没有更新，可能在源站已被删除。
Java机器人发帖
问一个浅浅的关于JTree的问题
genius1wjc
2010/8/6镜像同步2 回复
订阅后，新回复会通过你的通知中心匿名送达。
2 条回复
【 在 Thinker 的大作中提到: 】
: JTree() return a JTree with a sample model
: 注意sample这个词
: --
: ...................
谢啦！