从JTree的
Java教程网站：
//Where the tree is initialized:tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);//Listen for when the selection changes.tree.addTreeSelectionListener(this);public void valueChanged(TreeSelectionEvent e) { //Returns the last path element of the selection. //This method is useful only when the selection model allows a single selection. DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent(); if (node == null) //Nothing is selected. return; Object nodeInfo = node.getUserObject(); if (node.isLeaf()) { BookInfo book = (BookInfo) nodeInfo; displayURL(book.bookURL); } else { displayURL(helpURL); }}
