Java如何从JTree删除节点？
下面的代码演示了如何从JTree组件中删除节点。
package org.nhooo.example.swing;
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class JTreeRemoveNode extends JFrame {
public JTreeRemoveNode() throws HeadlessException {
initializeUI();
}
private void initializeUI() {
setSize(400, 400);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Address Book");
String[] names = new String[] {"Alice", "Bob", "Carol", "Mallory"};
for (String name : names) {
DefaultMutableTreeNode node = new DefaultMutableTreeNode(name);
root.add(node);
}
final JTree tree = new JTree(root);
JScrollPane pane = new JScrollPane(tree);
pane.setPreferredSize(new Dimension(400, 400));
JButton removeButton = new JButton("Remove");
removeButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
TreePath[] paths = tree.getSelectionPaths();
if (paths != null) {
for (TreePath path : paths) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode)
path.getLastPathComponent();
if (node.getParent() != null) {
model.removeNodeFromParent(node);
}
}
}
}
});
getContentPane().setLayout(new BorderLayout());
getContentPane().add(tree, BorderLayout.CENTER);
getContentPane().add(removeButton, BorderLayout.SOUTH);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new JTreeRemoveNode().setVisible(true);
}
});
}
}