How to set selected JTree from outside?

Question

I have a JTree for example
-A
  -a
  -b
  -c
-B
  -a
  -b
  -c
-C
  -a
  -b
  -cif the tree is All expand , it is easy to select the the tree by setSelectionRow(5), the result is "B.a", but how to select the the tree if all collap
-A
-B
-C
{code}
let say i want to select "B.c", it can't use setSelectionRow(7) becouse the row between 0-2. So how to select the tree if the tree is *collap*?
thx..                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

i had try use setSelectionPath but still can't wotk
this sample code:
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JTree;
import javax.swing.tree.*;
import javax.swing.*;
public class test_tree extends JFrame{
    JTree tree;
    DefaultMutableTreeNode root_tree;
    test_tree(){
        //DefaultMutableTreeNode root_tree = new DefaultMutableTreeNode("Root",true);
        root_tree = new DefaultMutableTreeNode();
        DefaultMutableTreeNode child_tree;
        DefaultMutableTreeNode child_tree2;
        DefaultMutableTreeNode child_tree3;
        child_tree = new DefaultMutableTreeNode("A1",true);
        child_tree.add(new DefaultMutableTreeNode("A1.1",false));
        child_tree.add(new DefaultMutableTreeNode("A1.2",false));
        child_tree.add(new DefaultMutableTreeNode("A1.3",false));
        child_tree2 = new DefaultMutableTreeNode("B2",true);
        child_tree2.add(new DefaultMutableTreeNode("B2.1",false));
        child_tree2.add(new DefaultMutableTreeNode("B2.2",false));
        child_tree2.add(new DefaultMutableTreeNode("B2.4",false));
        child_tree3 = new DefaultMutableTreeNode("C3",true);
        child_tree3.add(new DefaultMutableTreeNode("C3.1",false));
        child_tree3.add(new DefaultMutableTreeNode("C3.2",false));
        child_tree3.add(new DefaultMutableTreeNode("C3.3",false));
        root_tree.add( child_tree);
        root_tree.add( child_tree2);
        root_tree.add( child_tree3);
        tree = new JTree(root_tree);
        tree.setRootVisible(false);
        tree.setSize(100,300);
        add(tree);
        JButton bt = new JButton("witPath");
        bt.setSize(new Dimension (80, 30));
        bt.setLocation(200,100);
        bt.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                tree.expandPath(new TreePath(root_tree.getNextNode().getChildAt(1)) );
                tree.setSelectionPath(new TreePath(root_tree.getNextNode().getChildAt(1)) );
        add(bt);
        JButton br = new JButton("witROW");
        br.setSize(new Dimension (80, 30));
        br.setLocation(200,150);
        br.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                tree.expandRow(1);
                tree.setSelectionRow(3);
        add(br);
        setSize(400,400);
        setLayout(null);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     public static void main(String args[]){
            new test_tree();
}thx..