Here you can find the source of expandEntireTree(JTree tree, DefaultMutableTreeNode root, boolean expandRoot)
@SuppressWarnings("unchecked") public static void expandEntireTree(JTree tree, DefaultMutableTreeNode root, boolean expandRoot)
//package com.java2s; /******************************************************************************* * Copyright (c) JavaPEG developers/*from w w w . java2 s .c o m*/ * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. ******************************************************************************/ import javax.swing.*; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreePath; import java.util.*; public class Main { @SuppressWarnings("unchecked") public static void expandEntireTree(JTree tree, DefaultMutableTreeNode root, boolean expandRoot) { if (expandRoot) { tree.expandPath(new TreePath(root.getPath())); } Enumeration<DefaultMutableTreeNode> children = root.children(); while (children.hasMoreElements()) { DefaultMutableTreeNode child = children.nextElement(); tree.expandPath(new TreePath(child.getPath())); if (child.children().hasMoreElements()) { expandEntireTree(tree, child, expandRoot); } } } }