Java JTree：如何获取所选项目的文本？
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时间：2020-08-14 14:54:54 来源:igfitidea点击:
JTree: how to get the text of selected item?
提问by stighy
How can I get the text of selected item in a JTree?
如何在 a 中获取所选项目的文本JTree？
采纳答案by Artur
From Java tutorial website on JTree:
从JTree上的 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);
}
}
回答by Alireza815
DefaultMutableTreeNode newchild=new DefaultMutableTreeNode(textField.getText());
DefaultMutableTreeNode SelectedNode= (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
DefaultTreeModel treemodel=(DefaultTreeModel) tree.getModel();
JOptionPane.showMessageDialog(null, SelectedNode.getUserObject().toString());
if(SelectedNode!=null)
treemodel.insertNodeInto(newchild, SelectedNode, SelectedNode.getChildCount());
回答by baybora.oren
DefaultMutableTreeNode selectedElement
=(DefaultMutableTreeNode)tree.getSelectionPath().getLastPathComponent();
.....
System.out.println(selectedElement.getUserObject());
//For multiple selection you can use
TreePath[] treePaths = tree.getSelectionModel().getSelectionPaths();
for (TreePath treePath : treePaths) {
DefaultMutableTreeNode selectedElement = (DefaultMutableTreeNode)treePath.getLastPathComponent();
Object userObject = selectedElement.getUserObject(); //Do what you want with selected element's user object
}
