JTree:如何获取所选项目的文本? [英] JTree: how to get the text of selected item?

问题描述

如何在 JTree 中获取所选项目的文本?

How can I get the text of selected item in a JTree?

推荐答案

从Java教程网站上 JTree :

From Java tutorial website on JTree:

//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);
    }

}

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