Java:如何以编程方式选择和扩展JTree中的多个节点？

import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeModel;
import java.awt.Component;
import java.util.Objects;

public class TreeSelection {
    public static void main(String[] args) {
        JTree tree = new JTree();
        tree.setModel(createModel());

        TreeCellRenderer renderer = new MyRenderer();
        tree.setCellRenderer(renderer);

        // Select the second node in the tree
        int node = 1;
        tree.getSelectionModel().setSelectionPath(new TreePath(tree.getModel().getRoot(), node));

        // Get the selected node
        Object selectedNode = tree.getSelectionModel().getSelectedItem();

        // Print the selected node
        System.out.println("Selected node: " + selectedNode);
    }

    public static DefaultTreeModel createModel() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
        root.add(new DefaultMutableTreeNode("node1"));
        root.add(new DefaultMutableTreeNode("node2"));
        root.add(new DefaultMutableTreeNode("node3"));

        DefaultTreeModel model = new DefaultTreeModel(root);
        return model;
    }

    public static class MyRenderer implements TreeCellRenderer {
        public Component getTreeCellRendererComponent(
            JTree tree,
            Object value,
            boolean selected,
            boolean expanded,
            boolean leaf,
            int row,
            boolean hasFocus
        ) {
            String stringValue = Objects.toString(value, "");
            setText(stringValue);

            if (selected) {
                setBackground(new java.awt.Color(255, 255, 255));
                setBackground(tree.getSelectionBackground());
            } else {
                setBackground(tree.getBackground());
            }

            return this;
        }
    }
}