Here you can find the source of expandNodesAtLevel(int level, JTree tree, TreePath parent)
static void expandNodesAtLevel(int level, JTree tree, TreePath parent)
//package com.java2s; /* TouchStone design platform is a software to design protocols for lab * * experiments. It is published under the terms of a BSD license * * (see details below) * * Author: Caroline Appert (appert@lri.fr) * * Copyright (c) 2010 Caroline Appert and INRIA, France. * * TouchStone design platform reuses parts of an early version which were * * programmed by Matthis Gilbert. * *********************************************************************************/ import java.util.Enumeration; import javax.swing.JTree; import javax.swing.tree.TreeNode; import javax.swing.tree.TreePath; public class Main { static void expandNodesAtLevel(int level, JTree tree, TreePath parent) { if (level == 0) return; TreeNode node = (TreeNode) parent.getLastPathComponent(); if (node.getChildCount() >= 0) { for (Enumeration<?> e = node.children(); e.hasMoreElements();) { TreeNode n = (TreeNode) e.nextElement(); TreePath path = parent.pathByAddingChild(n); tree.expandPath(path);//from ww w. jav a 2 s .co m expandNodesAtLevel(level - 1, tree, path); } } } }