Here you can find the source of getIndexOf(JTabbedPane tabbedPane, Component component)
public static int getIndexOf(JTabbedPane tabbedPane, Component component)
//package com.java2s; /*/*from ww w . ja v a 2s.com*/ Strandz LGPL - an API that matches the user to the data. Copyright (C) 2007 Chris Murphy Strandz LGPL is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA The authors can be contacted via www.strandz.org */ import javax.swing.*; import java.awt.Component; public class Main { public static int getIndexOf(JTabbedPane tabbedPane, Component component) { int result = -1; for (int i = 0; i < tabbedPane.getComponentCount(); i++) { Component comp = tabbedPane.getComponentAt(i); if (comp == component) { result = i; break; } } return result; } }