Here you can find the source of expandAll(JTree tree)
public static void expandAll(JTree tree)
//package com.java2s; /*/* w w w . j a v a 2s . co m*/ * Copyright 2012-2014 Dan Cioca * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import javax.swing.JTree; import javax.swing.tree.TreePath; public class Main { public static void expandAll(JTree tree) { tree.expandPath(new TreePath(tree.getModel().getRoot())); int oldRowCount = 0; do { int rowCount = tree.getRowCount(); if (rowCount == oldRowCount) break; oldRowCount = rowCount; for (int i = 0; i < rowCount; i++) { tree.expandRow(i); } } while (true); } }